How should you set the output budget for claude-sonnet-4-6?

For claude-sonnet-4-6, set the max_tokens or max_completion_tokens parameter to control spending per call. Start with a budget aligned to your typical response length and increase only when longer outputs are genuinely needed. Monitor token usage in the API response headers to tune your budget over time.

Can you call Claude Sonnet 4.6 with the SDK you already use?

Yes. Sonnet 4.6 is served through a compatible endpoint. You can continue using your existing SDK by changing the base URL and model ID.

What is the max output length for claude-sonnet-4-6?

claude-sonnet-4-6 supports up to 128000 output tokens per request. Plan your prompts to stay within this limit, and use the max_tokens or max_completion_tokens parameter to control output length.

When was Claude Sonnet 4.6 released, and is it still maintained?

Claude Sonnet 4.6 was released on 2026-02-17. Its catalog status is stable. Check the model page for deprecation notices before you build a long-lived integration on it.

Does Claude Sonnet 4.6 support tool calling and structured output?

Confirm the current capabilities in the model documentation. Sonnet 4.6 is designed for agents and professional work. Test with your specific tool definitions.

Does claude-sonnet-4-6 have a free tier?

Claude Sonnet 4.6 is billed per use and the record publishes no free-tier allowance. The current published rates are input $3.0000 per 1M tokens and output $15.0000 per 1M tokens. Trial credit or promotional quota is tied to your account rather than to the model, so check the console before planning around a free tier.

How do you get a cache hit on claude-sonnet-4-6?

To get a cache hit on claude-sonnet-4-6, send requests with identical prompt prefixes. The cache is keyed by the beginning of your prompt; as long as the prefix matches a previous request, subsequent calls benefit from the lower cached rate. Keep system messages and initial context consistent across calls for best results.

Model detail

Claude Sonnet 4.6

Provided by Anthropic

Pay-as-you-go

Sonnet 4.6 is Anthropic's most capable Sonnet-class model yet, with frontier performance across coding, agents, and professional work. It excels at iterative development, complex codebase navigation, end-to-end project management with memory, polished document creation, and confident computer use for web QA and workflow automation.

Model specs

Model ID: claude-sonnet-4-6

Context length: 1M
Max output: 128K
I/O modalities
Released: 2026-02

API endpoints

One MixRoute gateway, OpenAI-compatible

Anthropic Messages /v1/messages POST
OpenAI-compatible /v1/chat/completions POST
Gemini /v1beta/models/{model}:generateContent POST

Pricing

Flat rate, unit: /1M Tokens

Input

$3.0000 /1M Tokens

Completion

$15.0000 /1M Tokens

Cache read

$0.3000 /1M Tokens

Cache creation

$3.7500 /1M Tokens

Selection summary

Quickly judge whether it fits your workload

What is this model good for?

Iterative development, codebase navigation, and computer use

Use Sonnet 4.6 for iterative development, complex codebase navigation, end-to-end project management, polished document creation, and confident computer use for web QA and workflow automation.

What should you check before using it?

Test computer use and project management capabilities

Sonnet 4.6 excels at computer use for web QA and workflow automation. Test these specific capabilities to confirm they meet your requirements. Knowledge cutoff: 2025-08.

Why use it through MixRoute?

Swap the base URL, keep the Claude Sonnet 4.6 client

MixRoute serves Claude Sonnet 4.6 on the OpenAI-compatible endpoint /v1/chat/completions; point your existing client at https://api.mixroute.ai/v1 with the model ID claude-sonnet-4-6 and re-run your integration tests.

Capabilities & compatibility

Unconfirmed capabilities stay "Unknown," no guesses

Tool calling

Claude Sonnet 4.6 supports function and tool calls.

EX Send a tools definition; the response returns tool_calls to execute and feed results back.

Structured output

Claude Sonnet 4.6 can produce JSON-formatted output on demand.

EX response_format: { type: "json_schema" } forces valid JSON output.

Streaming

Claude Sonnet 4.6 supports streamed responses.

EX stream: true streams tokens incrementally, so chat UIs render as they arrive.

Prompt caching

Claude Sonnet 4.6 supports prompt caching under supported routing conditions.

EX Keep the system prompt and tool definitions at the start of the request; repeated prefixes are automatically billed at the cache-read rate.

Vision input

Claude Sonnet 4.6 can process image inputs alongside text.

EX Pass a base64-encoded image in a image_url content part alongside text messages.

OpenAI SDK

Call Claude Sonnet 4.6 through MixRoute's OpenAI-compatible endpoint.

EX Change base_url to https://api.mixroute.ai/v1; everything else follows the OpenAI style.

Token cost estimator

Live estimate from this page's pricing, not an actual bill

Input tokens Max per request 1M

Output tokens Max per request 128K

Requests / month

Cache hit rate 0%

Share of the same prefix read repeatedly, up to 100%

FAQ

Sonnet 4.6 is Anthropic’s most capable Sonnet-class model, with frontier performance across coding, agents, and professional work. It excels at iterative development, complex codebase navigation, and confident computer use.

Get started

01

Create an API key

Generate a key in the Console; one key calls every model.
02

Set the base URL

Fully OpenAI SDK-compatible; just swap the URL to connect.

https://api.mixroute.ai/v1
03

Specify the model ID

In the request's model field, enter:

claude-sonnet-4-6

Create an API key

New users get $5 in free credits

Test this model and alternate routes with the same request format

Start from a real workload, then let quality, total cost, and failure conditions decide whether to send production traffic.

Create an API key View integration docs