Anthropic · Model guide

Claude Sonnet 5

anthropic/claude-sonnet-5

The Sonnet of the fifth generation, built for agents that plan, drive browsers and terminals, and run without supervision. It carries the same five effort levels as Opus 5 and lands close to Opus 4.8 on Anthropic's agentic evaluations.

Modalities

Context

Max output

128K

Price / 1M tokens

$ 2.00in$ 10.00out

StreamingTool callingJSON outputImage inputThinking mode · can be turned off

What this model is good at

What the vendor positions it for, and which of our models to reach for instead.

VendorClaude Sonnet 5 is built to be the most agentic Sonnet model yet.source

Best for

Agentic coding · Anthropic reports sustained autonomous coding and tool use close to Opus 4.8.(vendor claim)source
High-volume agent workloads · Its effort ladder reaches down to low, which Anthropic recommends for high-volume and latency-sensitive work.(vendor claim)source

Neighbouring models

anthropic/claude-opus-5stronger —Opus 5 is the step up when the task justifies twice the input price.
anthropic/claude-haiku-4-5cheaper —Haiku 4.5 is cheaper and faster again for short, latency-bound calls.
anthropic/claude-sonnet-4-6predecessor —Sonnet 4.6 is the predecessor, now more expensive than its successor.

Compare them side by side →

Pricing and billing

Billed per token. Cached input is charged at the cache-read rate.

Price / 1M tokens	You pay
Input	$ 2.00
Output	$ 10.00
Cache read	$ 0.20
Cache write	$ 2.50

Estimate a request

Input tokens10,000

Output tokens2,000

Cache hit rate0%

$ 0.0400

Estimated cost per request

10.0K × $ 2.00
+ 2.0K × $ 10.00

≈ $ 40.00 per 1,000 requests

Capabilities and limits

What CrossModel guarantees across every route this model can take right now.

Context window: 1.0M tokens
Max output: 128.0K tokens
Input / output modalities: Text + Image → Text
Streaming: Supported
Tool calling: Supported
Structured output (JSON): Supported
Image input: Supported
Thinking mode: Supported· can be turned off
Reasoning effort: low · medium · high · xhigh · max
Available endpoints: /v1/chat/completions · /v1/responses · /v1/messages

First-party sources:Specsplatform.claude.comCapabilitiesplatform.claude.com 1 platform.claude.com 2 platform.claude.com 3 platform.claude.com 4

Published benchmarks

Scores the vendor reported, with the evaluation setup each one came from.

Agentic coding

Terminal-Bench 2.1
pass_rate·Anthropic · 2026-06-30setup not fully disclosed
80.4%

Coding

SWE-Bench Pro
resolved_rate·Anthropic · 2026-06-30setup not fully disclosed
63.2%

Computer use

OSWorld-Verified
success_rate·Anthropic · 2026-06-30setup not fully disclosed
81.2%

Knowledge work

GDPval-AA v2
elo·Anthropic · 2026-06-30setup not fully disclosed
1618

Reasoning

Humanity's Last Exam
accuracy·Anthropic · 2026-06-30setup not fully disclosed
No tools.
43.2%
Humanity's Last Exam (with tools)
accuracy·Anthropic · 2026-06-30setup not fully disclosed
Anthropic does not disclose which tools the run had.
57.4%

Vendor-reported numbers, not CrossModel measurements. Scores are only comparable when the benchmark version, metric and evaluation setup match, so nothing here is averaged or ranked.

Use it in your tools

Point the base URL at CrossModel and paste this model ID — every tool below has a setup guide.

Claude Code

Anthropic's official command-line coding assistant

Cursor

AI-first code editor

Cline

Open-source AI coding agent for VS Code

Codex

OpenAI's coding agent for ChatGPT desktop and the terminal

OpenCode

Open-source terminal coding assistant

Zed

High-performance, AI-native code editor

Open WebUI

Open-source, self-hosted AI chat interface

Continue

Open-source AI coding assistant for VS Code & JetBrains

See all integration guides →

Frequently asked questions

What is Claude Sonnet 5?

Claude Sonnet 5 is available on CrossModel as anthropic/claude-sonnet-5. It has a 1M-token context window and can return up to 128K tokens per request.

How much does Claude Sonnet 5 cost?

Currently $ 2.00 per 1M input tokens and $ 10.00 per 1M output tokens. Cached input is billed at $ 0.20 per 1M.

Does Claude Sonnet 5 support tool calling and structured output?

Tool calling: Supported · Structured output (JSON): Supported · Image input: Supported · Streaming: Supported · Thinking mode: Supported

Which endpoint do I call?

For text models, OpenAI Chat Completions (/v1/chat/completions), OpenAI Responses (/v1/responses) and Anthropic Messages (/v1/messages) all work — pick whichever your SDK already speaks.

Can I try it without writing code?

Yes. Sign in and open the Playground on this page to chat with the model directly — no API key needed. Usage is billed from your wallet at the normal rate.

Chat first, integrate later

Chat first, then wire it in once you like the answers.