Claude Sonnet

Model family at Anthropic · 5 models

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Claude Sonnet 5.5
Model · Claude Sonnet family
Now available: Full Claude Platform available on Google Cloud (Anthropic managed) · 1w
Claude Sonnet 5
Model · Claude Sonnet family
Price change: Claude Sonnet 5 keeps its $2 / $10 price permanently · Aug 10, 2026
Claude Sonnet 4.6
Model · Claude Sonnet family
Quality report: Anthropic confirms three changes degraded Claude Code quality · Apr 23, 2026
Claude Sonnet 4.5Retiring Nov 30, 2026
Model · Claude Sonnet family
Retiring: Claude Sonnet 4.5 deprecated, retiring November 30, 2026 · Sep 30, 2026
Claude Sonnet 4Retired Jun 15, 2026
Model · Claude Sonnet family
Retired: Claude Sonnet 4 and Claude Opus 4 retired · Jun 15, 2026

Updates

Claude API, Fable 5.1, Opus 5.5

5 products from Anthropic

Now available1w

Full Claude Platform available on Google Cloud (Anthropic managed)

Claude Models on Google Cloud (Anthropic managed) is generally available with US and Global endpoints. It gives Google Cloud customers the full Claude Platform feature set with Google Cloud IAM, billing and commitment drawdown. Fable 5.1, Opus 5.5, Sonnet 5.5 and Haiku 5.5 are available, and fast mode for Opus 5.5 costs $8 / $40 per million input and output tokens there.

Claude Sonnet 5.5, Opus 5.5, Gemini 4 Argon

5 models from Anthropic and Google and OpenAI

Benchmark1w

Vals Index: Sonnet 5.5 edges Opus 5.5 and Gemini 4 Argon

Vals AI's GDP-weighted index of finance, coding, legal and tax tasks ranks Claude Sonnet 5.5 first at 70.85%, Opus 5.5 at 70.18%, Gemini 4 Argon 69.24%, GPT-6 Astra 65.02% and GPT-6.1 Sol 63.94% as of October 21, 2026.

Gemini 4 Argon, Claude Opus 5.5, Claude Opus 5

6 models from Google and Anthropic and OpenAI

Benchmark1w

Arena text leaderboard: Gemini 4 Argon first, Opus 5.5 second, GPT-6 Astra 73rd

Arena's October 20, 2026 text leaderboard ranks Gemini 4 Argon (High) first at 1532 (4,900 votes), Claude Opus 5.5 (High) second at 1516, Claude Opus 5 (Max) fourth at 1509, Claude Sonnet 5.5 (xHigh) 28th at 1473, GPT-6.1 Sol (Max) 66th at 1443 and GPT-6 Astra (Max) 73rd at 1441.

Claude Opus 5.5, GPT-6 Astra, Sonnet 5.5

6 models from Anthropic and OpenAI and Google

Benchmark1w

Arena WebDev leaderboard: Opus 5.5 first, GPT-6 Astra second

Arena's October 19, 2026 WebDev leaderboard ranks Claude Opus 5.5 (Max) first at 1807 (2,925 votes), GPT-6 Astra (Max) second at 1774, Claude Sonnet 5.5 (xHigh) third at 1768, GPT-6.1 Sol (Max) fourth at 1753, Claude Opus 5 (Max) eighth at 1689 and Gemini 4 Argon (High) tenth at 1678.

Claude Opus 5.5, Sonnet 5.5, GPT-6 Astra

6 models from Anthropic and OpenAI and Google

Benchmark1w

Vals AI Terminal-Bench 4.0 with one harness: Opus 5.5 65.2%, Astra 59.6%, Argon 57.6%

Running every model in the same Mini-SWE-agent harness, Vals AI reports Claude Opus 5.5 at 65.15%, Sonnet 5.5 64.14%, GPT-6 Astra 59.60%, Gemini 4 Argon 57.58%, GPT-6.1 Sol 55.05% and Opus 5 53.53%. GPT-6.1 Sol cost $1.72 per test against $13.20 for Opus 5.5.

Antigravity, Claude Opus 5.5 and Claude Sonnet 5.5

3 products from Google and Anthropic

Now available2w

Antigravity 2.24 adds model choice for automations and Claude 5.5 models through Vertex AI

Antigravity app 2.24.0 lets automations run on Flash Lite, Flash or Pro, adds /compact and a redesigned side panel. With Application Default Credentials sign-in, the model picker offers Claude Opus 5.5 and Claude Sonnet 5.5 when the Google Cloud project has access to them.

Claude Sonnet 5.5

Model at Anthropic

Price change3w

Claude Sonnet 5.5 cache reads cut in half

Before

$0.20 per MTok cache reads

After

$0.10 per MTok cache reads

Claude Sonnet 5.5 and Claude Code

2 products from Anthropic

Benchmark3w