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Favicon for anthropic

Anthropic: Claude Sonnet 5

anthropic/claude-sonnet-5

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Sonnet 5 is Anthropic's most capable Sonnet-class model, with frontier performance across coding, agents, and professional work. It supports adaptive thinking with selectable reasoning effort levels (low, medium, high, max, and x-high), a 1M-token context window, and text, image, and file inputs. Sonnet 5 uses an updated tokenizer and includes real-time cyber safeguards that block certain high-risk dual-use activities.

Modalities
In / Out Price
$2 / $10per 1M
Context
1.0M
Released
Jun 30, 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 5 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: $2.20/M tokens input, $11/M tokens output
  • Google Vertex: $2.20/M tokens input, $11/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 5 on OpenRouter.

  • Claude 5 Sonnet Migration GuideCookbook

Explore more models

AI Models with Vision: Multimodal LLMs for Image UnderstandingCollectionAI Model RankingsRanking
Latency / throughput
$2.00$10.00$0.201.52s65 tps
100.00%
$2.00$10.00$0.201.41s74 tps
100.00%
$2.00$10.00$0.202.45s89 tps
100.00%
$2.00$10.00$0.201.53s82 tps
100.00%
$2.00$10.00$0.200.91s76 tps
100.00%
Not used in Standard routing:Why these endpoints are not used
$2.20$11.00$0.223.36s64 tps
100.00%
$2.20$11.00$0.22----
100.00%
$2.20$11.00$0.220.67s79 tps
100.00%
$2.20$11.00$0.221.57s90 tps
100.00%
$2.20$11.00$0.220.94s65 tps
100.00%
Throughput
90tok/s

P50, best across providers

Latency
0.67s

P50, best provider

AutoExacto benchmarks
GPQA DiamondTAU-BenchAzure (US)89.8%76.0%Amazon Bedrock (US)89.5%76.2%Google Vertex (US)89.2%76.0%Google Vertex88.7%76.3%Amazon Bedrock88.4%76.4%Anthropic89.2%75.6%Amazon Bedrock (EU)89.2%75.3%Azure88.8%75.5%Google Vertex (EU)89.3%74.9%auto-routing88.7%75.4%
+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.
99.93%

Availability over the last 3 days

Last 72 hours
Availability 99.93%
3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability
99.93%
Without Routing
98.39%

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.
535Btokens
2.
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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.
303Btokens
3.
Favicon for https://descript.com/
Descript
AI Video & Podcast Editor
120Btokens
4.
Favicon for https://hellohaven.ai/
Hello Haven
new
115Btokens
5.
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.
53.6Btokens

Frequently asked questions

Sonnet 5 is Anthropic's most capable Sonnet-class model, with frontier performance across coding, agents, and professional work. It supports adaptive thinking with selectable reasoning effort levels (low, medium, high, max, and x-high), a 1M-token context window, and text, image, and file inputs.

The Claude Sonnet 5 documentation on OpenRouter includes the Claude 5 Sonnet Migration Guide cookbook. The quickstart covers API keys and your first request, and the API reference lists every parameter.

Claude Sonnet 5 costs $2.00/M input tokens and $10.00/M output tokens, with separate rates for Cache Read at $0.20/M tokens, Cache Write at $2.50/M tokens, Cache Write (1h) at $4.00/M tokens, and Web Search at $10.00/1K calls.

Claude Sonnet 5 has a 1,000,000 token context window. It supports up to 128,000 completion tokens.

Yes. Claude Sonnet 5 accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.

Claude Sonnet 5 accepts text, images, and files such as PDFs as input and returns text.

Claude Sonnet 5 is served by 5 providers on OpenRouter: Claude Platform on AWS, Azure, Google Vertex, Amazon Bedrock, and Anthropic. 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 5 was released on June 30, 2026.