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Claude Sonnet 5.5

by Anthropic · Released Sep 2026

Multimodal1M Context
80.7
avg score
Rank #21
Compare
Better than 93% of all models
Context
1.0M tokens (~500 books)
Input $/1M
$2.00
Output $/1M
$10.00
Type
multimodal
License
Proprietary
Benchmarks
20 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 20 benchmarks · BenchGecko score 80.7. Top scores: OTIS Mock AIME 2024-2025 (100.0%), Proofbench (100.0%), GPQA diamond (94.1%).

Looking for similar performance at lower cost?
MiMo-V2-Flash scores 81.7 (101% as good) at $0.09/1M input · 96% cheaper
Capabilities
coding
57.0
#61 globally
math
89.8
#14 globally
knowledge
48.4
#143 globally
agentic
75.5
#4 globally
general
75.2
#2 globally
speed
58.8
#13 globally
Benchmark Scores
Compare All
Tested on 20 benchmarks · Ranked across 6 categories
Score Distribution (all 319 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·
Chess Puzzles

Tactical chess puzzles testing pattern recognition and multi-move calculation. Measures strategic reasoning ability.

56.9·
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-5.2-CodexOpenAI logovs GPT-5.6 SolOpenAI logovs GPT-5.4 Pro
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
39.6+9.3
n/an/actx29 benchmarks
Jan 2024
49.0+9.4
n/an/actx27 benchmarks
Feb 2025
$3.00/M in200Kctx
May 2025
44.3-4.7
$3.00/M in200Kctx32 benchmarks
Sep 2025
44.0-0.3
$3.00/M in1.0Mctx(+800K)31 benchmarks
Sep 2025
$1.50/M in(-1.50)1.0Mctx
Feb 2026
52.3+8.3
$3.00/M in(+1.50)1.0Mctx30 benchmarks
Feb 2026
$1.50/M in(-1.50)1.0Mctx
Jun 2026
64.4+12.1
$2.00/M in(+0.50)1.0Mctx17 benchmarks
Jun 2026
$1.00/M in(-1)1.0Mctx
Sep 2026
80.7+16.3
$2.00/M in(+1)1.0Mctx20 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
Info
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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
Share & Export
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OpenAI logoGPT-5.2-Codex
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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 80.7. Context window: 1M tokens.

Related Models

GPT-5.2-Codex · OpenAIGPT-5.6 Sol · OpenAIGPT-5.4 Pro · OpenAIGPT-6 Sol · OpenAIMiMo-V2-Flash · xiaomi

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 2026-10-16

  • Claude Sonnet 5.5 by Anthropic. BenchGecko score 80.7, rank 21 of 319 scored models (normalized average of public benchmark scores).
  • List price $2.00 input · $10.00 output per 1M tokens (as of 2026-10-16).
  • Sold by 8 providers (as of 2026-10-16): 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 63 (rank 3): 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 2026-10-16

Claude Sonnet 5.5 · benchmarks, pricing and providers. BenchGecko, data as of 2026-10-16. 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