As of February 13, 2026, the streaming response format for Anthropic models has changed.
Model Overview
The model significantly advances its predecessor’s coding capabilities. It shows stronger planning, can handle longer and more complex agent-style workflows, operates more reliably in large codebases, and delivers improved code review and debugging that help it identify and fix its own mistakes. Beyond software development, Opus 4.6 applies these enhanced capabilities to everyday professional tasks, including financial analysis, research, and working with documents, spreadsheets, and presentations.
1️⃣ Required setup (don’t skip this)
▪ Create an account: Sign up on the AI/ML API website (if you don’t have one yet).
▪ Generate an API key: In your account dashboard, create an API key and make sure it’s enabled in the UI.
2️ Copy the code example
At the bottom of this page, pick the snippet for your preferred programming language (Python / Node.js) and copy it into your project.
3️ Update the snippet for your use case
▪ Insert your API key: replace <YOUR_AIMLAPI_KEY> with your real AI/ML API key.
▪ Select a model: set the model field to the model you want to call.
▪ Provide input: fill in the request input field(s) shown in the example (for example, messages for chat/LLM models, or other inputs for image/video/audio models).
4️ (Optional) Tune the request
Depending on the model type, you can add optional parameters to control the output (e.g., generation settings, quality, length, etc.). See the API schema below for the full list.
5️ Run your code
Run the updated code in your development environment. Response time depends on the model and request size, but simple requests typically return quickly.
If you need a more detailed walkthrough for setting up your development environment and making a request step by step — feel free to use our Quickstart guide.
API Schema
post
Body
modelstring · enumRequiredPossible values:
max_tokensnumber · min: 1Optional
The maximum number of tokens that can be generated in the chat completion. This value can be used to control costs for text generated via API.
max_completion_tokensinteger · min: 1Optional
An upper bound for the number of tokens that can be generated for a completion, including visible output tokens and reasoning tokens.
streambooleanOptional
If set to True, the model response data will be streamed to the client as it is generated using server-sent events.
Number between -2.0 and 2.0. Positive values penalize new tokens based on their existing frequency in the text so far, decreasing the model's likelihood to repeat the same line verbatim.
logprobsboolean · nullableOptional
Whether to return log probabilities of the output tokens or not. If True, returns the log probabilities of each output token returned in the content of message.
top_logprobsnumber · max: 20 · nullableOptional
An integer between 0 and 20 specifying the number of most likely tokens to return at each token position, each with an associated log probability. logprobs must be set to True if this parameter is used.
ninteger · min: 1 · nullableOptional
How many chat completion choices to generate for each input message. Note that you will be charged based on the number of generated tokens across all of the choices. Keep n as 1 to minimize costs.
Positive values penalize new tokens based on whether they appear in the text so far, increasing the model's likelihood to talk about new topics.
seedinteger · min: 1Optional
This feature is in Beta. If specified, our system will make a best effort to sample deterministically, such that repeated requests with the same seed and parameters should return the same result.
top_pnumber · min: 0.1 · max: 1Optional
An alternative to sampling with temperature, called nucleus sampling, where the model considers the results of the tokens with top_p probability mass. So 0.1 means only the tokens comprising the top 10% probability mass are considered.
We generally recommend altering this or temperature but not both.
temperaturenumber · max: 2Optional
What sampling temperature to use. Higher values like 0.8 will make the output more random, while lower values like 0.2 will make it more focused and deterministic. We generally recommend altering this or top_p but not both.
stopany ofOptional
Up to 4 sequences where the API will stop generating further tokens. The returned text will not contain the stop sequence.
stringOptional
or
string[]Optional
or
any · nullableOptional
tool_choiceany ofOptional
Controls which (if any) tool is called by the model. none means the model will not call any tool and instead generates a message. auto means the model can pick between generating a message or calling one or more tools. required means the model must call one or more tools. Specifying a particular tool via {"type": "function", "function": {"name": "my_function"}} forces the model to call that tool.
none is the default when no tools are present. auto is the default if tools are present.
string · enumOptional
none means the model will not call any tool and instead generates a message. auto means the model can pick between generating a message or calling one or more tools. required means the model must call one or more tools.
Possible values:
or
parallel_tool_callsbooleanOptional
Whether to enable parallel function calling during tool use.
reasoning_effortstring · enumOptional
Constrains effort on reasoning for reasoning models. Currently supported values are low, medium, and high. Reducing reasoning effort can result in faster responses and fewer tokens used on reasoning in a response.
Possible values:
response_formatone ofOptional
An object specifying the format that the model must output.
or
or
Responses
200Success
post
/v1/chat/completions
200Success
Code Example #1
Response
Code Example #2: Streaming Mode
As of February 13, 2026, the streaming response format for Anthropic models has changed.
Specifically, the usage fields were renamed as follows:
{
"id": "chatcmpl-CQ9FPg3osank0dx0k46Z53LTqtXMl",
"object": "chat.completion",
"created": 1762343744,
"choices": [
{
"index": 0,
"message": {
"role": "assistant",
"content": "Hello! I'm just a program, so I don't have feelings, but I'm here and ready to help you. How can I assist you today?",
"refusal": null,
"annotations": null,
"audio": null,
"tool_calls": null
},
"finish_reason": "stop",
"logprobs": null
}
],
"model": "anthropic/claude-opus-4-6",
"usage": {
"prompt_tokens": 137,
"completion_tokens": 914,
"total_tokens": 1051,
"completion_tokens_details": null,
"prompt_tokens_details": null
}
}
import requests
import json # for getting a structured output with indentation
response = requests.post(
"https://api.aimlapi.com/v1/chat/completions",
headers={
# Insert your AIML API Key instead of <YOUR_AIMLAPI_KEY>:
"Authorization":"Bearer <YOUR_AIMLAPI_KEY>",
"Content-Type":"application/json"
},
json={
"model":"anthropic/claude-opus-4-6",
"messages":[
{
"role":"user",
"content":"Hi! What do you think about mankind?" # insert your prompt
}
]
}
)
data = response.json()
print(json.dumps(data, indent=2, ensure_ascii=False))
async function main() {
const response = await fetch('https://api.aimlapi.com/v1/chat/completions', {
method: 'POST',
headers: {
// insert your AIML API Key instead of <YOUR_AIMLAPI_KEY>
'Authorization': 'Bearer <YOUR_AIMLAPI_KEY>',
'Content-Type': 'application/json',
},
body: JSON.stringify({
model: 'anthropic/claude-opus-4-6',
messages:[
{
role:'user',
content: 'Hi! What do you think about mankind?' // insert your prompt here
}
],
}),
});
const data = await response.json();
console.log(JSON.stringify(data, null, 2));
}
main();
{
"id": "msg_018e8mCDfQGYKTGHTdUKNmuU",
"object": "chat.completion",
"model": "claude-opus-4-6",
"choices": [
{
"index": 0,
"message": {
"reasoning_content": "",
"content": "Hi! That's a big question. Here are some honest thoughts:\n\n**What I find remarkable**\n- Human creativity and problem-solving ability\n- The capacity for empathy, cooperation, and self-sacrifice\n- Building cumulative knowledge across generations\n- Art, music, science - the drive to understand and express\n\n**What's more complicated**\n- Humans have a real capacity for both great kindness and great cruelty\n- There's often a gap between what people value in principle and how they actually behave\n- Progress on big problems (poverty, conflict, environment) is real but uneven and slow\n\n**My honest position**\nI'd be cautious about sweeping judgments in either direction. \"Humanity is wonderful\" and \"humanity is terrible\" are both oversimplifications. People are complex, shaped by circumstances, and capable of change.\n\nI should also be transparent: I'm an AI, so my \"perspective\" has limits. I don't experience human life. I can observe patterns in what humans have written and done, but I'd weight your lived experience of humanity more heavily than my outside view.\n\nWhat prompted the question? I'm curious whether you're feeling more optimistic or pessimistic about it.",
"role": "assistant"
},
"finish_reason": "end_turn",
"logprobs": null
}
],
"created": 1770635443,
"usage": {
"prompt_tokens": 16,
"completion_tokens": 264,
"total_tokens": 280
},
"meta": {
"usage": {
"credits_used": 17368
}
}
}
import requests
import json # for getting a structured output with indentation
response = requests.post(
"https://api.aimlapi.com/v1/chat/completions",
headers={
# Insert your AIML API Key instead of <YOUR_AIMLAPI_KEY>:
"Authorization":"Bearer <YOUR_AIMLAPI_KEY>",
"Content-Type":"application/json"
},
json={
"model":"anthropic/claude-opus-4-6",
"messages":[
{
"role":"user",
"content":"Hi! What do you think about mankind?" # insert your prompt
}
]
}
)
data = response.json()
print(json.dumps(data, indent=2, ensure_ascii=False))
curl -L \
--request POST \
--url 'https://api.aimlapi.com/v1/chat/completions' \
--header 'Authorization: Bearer <YOUR_AIMLAPI_KEY>' \
--header 'Content-Type: application/json' \
--data '{
"model": "anthropic/claude-opus-4-6",
"messages": [
{
"role": "user",
"content": "Hi! What do you think about mankind?"
}
],
"stream": true
}'
data: {"id":"msg_018vTp5RY3pv9qS1euXt8AWb","choices":[{"index":0,"delta":{"content":"","role":"assistant","refusal":null}}],"created":1770989120,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
data: {"id":"","choices":[{"index":0,"delta":{"role":"assistant","content":"","refusal":null}}],"created":1770989120,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
data: {"id":"","choices":[{"index":0,"delta":{"content":"Hi","role":"assistant","refusal":null}}],"created":1770989120,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
data: {"id":"","choices":[{"index":0,"delta":{"content":"! That","role":"assistant","refusal":null}}],"created":1770989121,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
data: {"id":"","choices":[{"index":0,"delta":{"content":"'s a","role":"assistant","refusal":null}}],"created":1770989121,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
data: {"id":"","choices":[{"index":0,"delta":{"content":" big","role":"assistant","refusal":null}}],"created":1770989121,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
data: {"id":"","choices":[{"index":0,"delta":{"content":" question.","role":"assistant","refusal":null}}],"created":1770989121,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
data: {"id":"","choices":[{"index":0,"delta":{"content":" Here","role":"assistant","refusal":null}}],"created":1770989121,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
data: {"id":"","choices":[{"index":0,"delta":{"content":" are some honest","role":"assistant","refusal":null}}],"created":1770989121,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
data: {"id":"","choices":[{"index":0,"delta":{"content":" thoughts:","role":"assistant","refusal":null}}],"created":1770989121,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
data: {"id":"","choices":[{"index":0,"delta":{"content":"\n\n**What I find","role":"assistant","refusal":null}}],"created":1770989121,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
data: {"id":"","choices":[{"index":0,"delta":{"content":" remarkable","role":"assistant","refusal":null}}],"created":1770989121,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
data: {"id":"","choices":[{"index":0,"delta":{"content":"**","role":"assistant","refusal":null}}],"created":1770989121,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
data: {"id":"","choices":[{"index":0,"delta":{"content":"\n-","role":"assistant","refusal":null}}],"created":1770989121,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
data: {"id":"","choices":[{"index":0,"delta":{"content":" Human","role":"assistant","refusal":null}}],"created":1770989121,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
data: {"id":"","choices":[{"index":0,"delta":{"content":" creativity and problem","role":"assistant","refusal":null}}],"created":1770989121,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
data: {"id":"","choices":[{"index":0,"delta":{"content":"-solving are","role":"assistant","refusal":null}}],"created":1770989121,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
data: {"id":"","choices":[{"index":0,"delta":{"content":" genuinely impressive\n- The capacity","role":"assistant","refusal":null}}],"created":1770989121,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
data: {"id":"","choices":[{"index":0,"delta":{"content":" for empathy,","role":"assistant","refusal":null}}],"created":1770989121,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
data: {"id":"","choices":[{"index":0,"delta":{"content":" cooperation","role":"assistant","refusal":null}}],"created":1770989121,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
data: {"id":"","choices":[{"index":0,"delta":{"content":", and building","role":"assistant","refusal":null}}],"created":1770989121,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
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data: {"id":"","choices":[{"index":0,"delta":{"content":"\n-","role":"assistant","refusal":null}}],"created":1770989122,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
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data: {"id":"","choices":[{"index":0,"delta":{"content":" curiosity -","role":"assistant","refusal":null}}],"created":1770989122,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
data: {"id":"","choices":[{"index":0,"delta":{"content":" science","role":"assistant","refusal":null}}],"created":1770989122,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
data: {"id":"","choices":[{"index":0,"delta":{"content":", art, philosophy all","role":"assistant","refusal":null}}],"created":1770989122,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
data: {"id":"","choices":[{"index":0,"delta":{"content":" reflect","role":"assistant","refusal":null}}],"created":1770989122,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
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data: {"id":"","choices":[{"index":0,"delta":{"content":" drive to understand and create","role":"assistant","refusal":null}}],"created":1770989122,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
data: {"id":"","choices":[{"index":0,"delta":{"content":"\n\n**What seems","role":"assistant","refusal":null}}],"created":1770989122,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
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data: {"id":"","choices":[{"index":0,"delta":{"content":"**\n- Humans often","role":"assistant","refusal":null}}],"created":1770989122,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
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data: {"id":"","choices":[{"index":0,"delta":{"content":"ses\n- Trib","role":"assistant","refusal":null}}],"created":1770989123,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
data: {"id":"","choices":[{"index":0,"delta":{"content":"alism and conflict","role":"assistant","refusal":null}}],"created":1770989123,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
data: {"id":"","choices":[{"index":0,"delta":{"content":" seem","role":"assistant","refusal":null}}],"created":1770989123,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
data: {"id":"","choices":[{"index":0,"delta":{"content":" persistent","role":"assistant","refusal":null}}],"created":1770989123,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
data: {"id":"","choices":[{"index":0,"delta":{"content":",","role":"assistant","refusal":null}}],"created":1770989123,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
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data: {"id":"","choices":[{"index":0,"delta":{"content":"'s a gap","role":"assistant","refusal":null}}],"created":1770989123,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
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data: {"id":"","choices":[{"index":0,"delta":{"content":"\n\n**My","role":"assistant","refusal":null}}],"created":1770989123,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
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data: {"id":"","choices":[{"index":0,"delta":{"content":" be straight","role":"assistant","refusal":null}}],"created":1770989124,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
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data: {"id":"","choices":[{"index":0,"delta":{"content":" I'm an","role":"assistant","refusal":null}}],"created":1770989124,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
data: {"id":"","choices":[{"index":0,"delta":{"content":" AI, so I don't experience","role":"assistant","refusal":null}}],"created":1770989124,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
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data: {"id":"","choices":[{"index":0,"delta":{"content":" by text","role":"assistant","refusal":null}}],"created":1770989124,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
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data: {"id":"","choices":[{"index":0,"delta":{"content":"\n- I'd","role":"assistant","refusal":null}}],"created":1770989124,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
data: {"id":"","choices":[{"index":0,"delta":{"content":" be skept","role":"assistant","refusal":null}}],"created":1770989124,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
data: {"id":"","choices":[{"index":0,"delta":{"content":"ical of any AI","role":"assistant","refusal":null}}],"created":1770989124,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
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data: {"id":"","choices":[{"index":0,"delta":{"content":" either","role":"assistant","refusal":null}}],"created":1770989124,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
data: {"id":"","choices":[{"index":0,"delta":{"content":" a","role":"assistant","refusal":null}}],"created":1770989125,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
data: {"id":"","choices":[{"index":0,"delta":{"content":" purely","role":"assistant","refusal":null}}],"created":1770989125,"model":"claude-opus-4-6","object":"chat.completion.chunk","usage":null}
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