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Favicon for anthropic

Anthropic: Claude Sonnet 4.6

anthropic/claude-sonnet-4.6

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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.

Modalities
In / Out Price
$3 / $15per 1M
Context
1.0M
Released
Feb 17, 2026
Compare
ProvidersPricingPerformanceUptimeAppsActivityDocumentationFAQExplore

Providers

Different companies host the same model. OpenRouter routes your request to one of them based on the routing mode you pick — Balanced (price + speed), Nitro (fastest), or Floor (cheapest).

Pricing

The average price customers actually pay for this model, next to the prices providers post. Caching and discounts mean the price actually paid is often well below the listed one.

Performance

Throughput is how fast the model writes (tokens per second — higher is better). Latency is total round-trip time (lower is better). TTFT is time-to-first-token — how long before you see anything appear (lower is better).

Uptime

Uptime is the percentage of the past 3 days that at least one provider was responding to requests. Availability is the percentage of time that inference was successfully served. OpenRouter continuously monitors and uses the next-best provider when one returns an error.

Apps

Public apps that send the most traffic to this model. Good signal for what real production workloads look like — and a hint at which use cases this model is best suited for.

Activity

Token volume and request traffic to this model over time.

API

Drop-in code to call this model. OpenRouter's API is OpenAI-compatible — most SDKs work by just swapping the base URL. The only thing that changes between models is the model slug below.

Anthropic: Claude Sonnet versions

Available through EU in-region routing

Anthropic: Claude Sonnet 4.6 is available through EU in-region routing. Requests sent to eu.openrouter.ai are decrypted in the EU and routed only to shared provider endpoints in Europe (the EU/EEA, the UK, and Switzerland).

Providers in Europe
Amazon Bedrock, Google Vertex
Prices in Europe
  • Amazon Bedrock: $3.30/M tokens input, $16.50/M tokens output
  • Google Vertex: $3.30/M tokens input, $16.50/M tokens output
Base URL
https://eu.openrouter.ai/api/v1
Plan
Requires Business or Enterprise. Self-serve on Business: no contract, no monthly minimum. OpenRouter Business for EU in-region routing

Fails closed: if no shared provider endpoint in Europe is available, the request errors instead of leaving the region. Requests served by your own BYOK key go to your deployment’s region, which you control. In-region routing docs

Documentation

Guides, cookbooks, blog posts, and tools for building with Anthropic: Claude Sonnet 4.6 on OpenRouter.

  • Claude 4.6 Migration GuideCookbook

Explore more models

AI Models with Vision: Multimodal LLMs for Image UnderstandingCollectionAI Model RankingsRanking
Latency / throughput
$3.00$15.00$0.300.83s42 tps
100.00%
$3.00$15.00$0.302.03s40 tps
95.00%
$3.00$15.00$0.300.97s49 tps
100.00%
$3.00$15.00$0.301.04s76 tps
99.94%
$3.00$15.00$0.301.46s56 tps
99.77%
Not used in Standard routing:Why these endpoints are not used
$3.30$16.50$0.330.89s69 tps
100.00%
$3.30$16.50$0.330.71s88 tps
100.00%
$3.30$16.50$0.331.73s46 tps
100.00%
$3.30$16.50$0.330.93s45 tps
100.00%
Throughput
88tok/s

P50, best across providers

Latency
0.71s

P50, best provider

AutoExacto benchmarks
GPQA DiamondTAU-BenchAmazon Bedrock81.6%75.6%Google Vertex82.2%74.6%Amazon Bedrock (US)81.5%75.3%Azure82.5%74.1%Anthropic81.7%74.8%Google Vertex (US)82.5%73.8%auto-routing82.4%73.9%Amazon Bedrock (EU)81.4%74.8%Google Vertex (EU)81.7%73.5%
+1 more providers
Uptime (3d)The model was reachable. Request routed to a provider.
100.00%
Availability (3d)The model returned inference from any provider. Errors and empty responses count against it.
99.92%

Availability over the last 3 days

Last 72 hours
Availability 99.92%
3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability
99.94%
Without Routing
97.90%

When an error occurs in an upstream provider, we can recover by routing to another healthy provider, if your request filters allow it. You can access per-provider uptime data programmatically through the Endpoints API. Learn more about our load balancing and provider routing options.

1.
Favicon for https://claude.ai/apple-touch-icon.png
Claude Code
Claude Code is Anthropic's agentic coding tool that reads your entire codebase, plans and executes changes across files, runs tests, and iterates on failures, all from natural language prompts.
80.2Btokens
2.
Favicon for https://openclaw.ai/
OpenClaw
OpenClaw is an open-source AI agent that connects to your messaging apps and takes real actions on your behalf, from running commands and browsing the web to managing files and sending emails.
62.3Btokens
3.
Favicon for https://nousresearch.com
Hermes Agent
Hermes Agent is an open-source, self-improving AI agent by Nous Research that runs persistently with memory across sessions, and builds reusable skills from experience. It comes with 40+ built-in tools, including web search, browser automation, and vision, plus scheduled automations and subagents.
58.7Btokens
4.
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pi
There are many coding agents, but this one is yours.
14.4Btokens
5.
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LangChain
new
12.5Btokens

Frequently asked questions

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.

The Claude Sonnet 4.6 documentation on OpenRouter includes the Claude 4.6 Migration Guide cookbook. The quickstart covers API keys and your first request, and the API reference lists every parameter.

Claude Sonnet 4.6 costs $3.00/M input tokens and $15.00/M output tokens, with separate rates for Cache Read at $0.30/M tokens, Cache Write at $3.75/M tokens, Cache Write (1h) at $6.00/M tokens, and Web Search at $10.00/1K calls.

Claude Sonnet 4.6 has a 1,000,000 token context window. It supports up to 128,000 completion tokens.

Yes. Claude Sonnet 4.6 accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.

Claude Sonnet 4.6 accepts text, images, and files such as PDFs as input and returns text.

Claude Sonnet 4.6 is served by 5 providers on OpenRouter: Claude Platform on AWS, Azure, Anthropic, Amazon Bedrock, and Google Vertex. Requests are routed to the best available provider, with automatic failover to the others, and you can pin or exclude providers with provider routing.

Claude Sonnet 4.6 was released on February 17, 2026.