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Claude Sonnet 5.5

by Anthropic · Released Sep 2026

Multimodal1M Context
89.2
avg score
Rank #7
Compare
Top 2% of all models
Context
1.0M tokens (~500 books)
Input $/1M
$2.00
Output $/1M
$10.00
Type
multimodal
License
Proprietary
Benchmarks
17 tested
Data as of
About

Claude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, succeeding Claude Sonnet 5 as a direct upgrade. It is especially strong at building features, fixing bugs, and producing...

Tested on 17 benchmarks · BenchGecko score 89.2. Top scores: OTIS Mock AIME 2024-2025 (100.0%), Proofbench (100.0%), GPQA diamond (94.1%).

Looking for similar performance at lower cost?
Step 3.5 Flash scores 89.5 (100% as good) at $0.10/1M input · 95% cheaper
Capabilities
coding
57.0
#61 globally
math
89.8
#11 globally
knowledge
70.3
#20 globally
agentic
75.5
#3 globally
general
75.2
#2 globally
speed
58.9
#13 globally
Benchmark Scores
Compare All
Tested on 17 benchmarks · Ranked across 6 categories
Score Distribution (all 312 models)
0255075100
▲ You are here
codingCompare coding →
Frontierswe
61.9·
Frontiercode
52.1·
mathCompare math →
OTIS Mock AIME 2024-2025

Mock AIME (American Invitational Mathematics Exam) problems from OTIS. Tests mathematical competition performance.

100.0·
FrontierMath-Tiers-1-3-v2-Private
88.8·
FrontierMath-Tier-4-v2-Private
80.5·
knowledgeCompare knowledge →
GPQA diamond

Graduate-level science questions written by PhD experts. Diamond subset contains questions where experts disagree, testing deep understanding.

94.1·
SimpleQA Verified

Simple factual questions with verified correct answers. Tests accuracy of basic knowledge retrieval. Low scores indicate hallucination.

46.5·
Quick compare:OpenAI logovs GPT-5 Chatstepfun logovs Step 3.5 FlashAnthropic logovs Claude Fable 5.1
Excellent (85+) Good (70-85) Average (50-70) Below (<50)
Model Family · Anthropic Claude Sonnet
Jan 2024
30.3
n/an/actx7 benchmarks
Jan 2024
39.8+9.5
n/an/actx29 benchmarks
Jan 2024
49.2+9.4
n/an/actx27 benchmarks
Feb 2025
$3.00/M in200Kctx
May 2025
44.5-4.7
$3.00/M in200Kctx32 benchmarks
Sep 2025
44.6+0.1
$3.00/M in1.0Mctx(+800K)31 benchmarks
Sep 2025
$1.50/M in(-1.50)1.0Mctx
Feb 2026
52.5+7.9
$3.00/M in(+1.50)1.0Mctx30 benchmarks
Feb 2026
$1.50/M in(-1.50)1.0Mctx
Jun 2026
66.3+13.8
$2.00/M in(+0.50)1.0Mctx17 benchmarks
Jun 2026
$1.00/M in(-1)1.0Mctx
Sep 2026
89.2+22.9
$2.00/M in(+1)1.0Mctx17 benchmarks
Sep 2026
$1.00/M in(-1)1.0Mctx
See the full Claude Sonnet family →
Recently Happened
Claude Sonnet 5.5 added
Sep 29, 2026
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Links
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claude-sonnet-5-5
Specifications
  • Typemultimodal
  • Context1.0M tokens (~500 books)
  • ReleasedSep 2026
  • LicenseProprietary
  • StatusActive
  • Cost / Message~$0.014
Available On
Anthropic logoAnthropic$2.00
Categories
codingmathknowledgeagenticgeneralspeed
Learn More
context-windowtransformertokens
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OpenAI logoGPT-5 Chat
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Claude Sonnet 5.5 is a proprietary multimodal AI model by Anthropic, released in September 2026. It has an average benchmark score of 89.2. Context window: 1M tokens.

Related Models

GPT-5 Chat · OpenAIStep 3.5 Flash · stepfunClaude Fable 5.1 · AnthropicQwen2.5 72B Instruct Abliterated · HuiHui AIClaude Opus 5 · Anthropic

Benchmarks

OTIS Mock AIME 2024-2025ProofbenchGPQA diamondFrontierMath-Tiers-1-3-v2-PrivateArtificial Analysis · Long Context Reasoning

Related Pages

Anthropic · ProviderAnthropic · EconomyAll ModelsCompare ModelsPricingDevelopers · APIContext Window · Glossary

Key facts · as of 2026-10-05

  • Claude Sonnet 5.5 by Anthropic. BenchGecko score 89.2, rank 7 of 312 scored models (normalized average of public benchmark scores).
  • List price $2.00 input · $10.00 output per 1M tokens (as of 2026-10-05).
  • Sold by 8 providers (as of 2026-10-05): Amazon Bedrock $2.00 in / $10.00 out · Anthropic $2.00 in / $10.00 out · Azure $2.00 in / $10.00 out · Claude Platform on AWS $2.00 in / $10.00 out · Google $2.00 in / $10.00 out · and 3 more. Every provider
  • Gecko Tests · Gecko Score 65 (rank 4): Who Are You B (Knows who made it) · Censorship Index A (Answers almost everything) · Knowledge Horizon A (Knows news up to May 2026) · Tokenizer Tax E (73% more tokens outside English).

How to cite · data as of 2026-10-05

Claude Sonnet 5.5 · benchmarks, pricing and providers. BenchGecko, data as of 2026-10-05. https://benchgecko.ai/model/claude-sonnet-5-5

Credit "Source: BenchGecko" with a link. Prices per provider and Gecko Tests are BenchGecko data (CC BY 4.0); benchmark scores keep their original source, listed in the JSON. JSON · llms.txt · MCP