Claude 4 Sonnet

May 2025
Retired 2026-06-15Replace withClaude Sonnet 5.5Newer versionGPT-6 LunaBetterMiMo v2.6 ProOpen weights
Claude 4 Sonnet
Compare in
on
—per task?
not available via APIprice
—output speed?
1Mcontext

Rankingin non-thinking mode?

Retired models are left out of the current rankings.

Alternatives?

ModelScoreCostPer taskWhat changes
BetterGPT-6 Lunalow+30%—$0.005Function calling only with none · Chat Completions+3OpenMiMo v2.6 Prothinking×2.8—$0.13Pass back reasoning_content+3BetterGPT-5.6 Lunalow+26%—$0.01BetterMiMo v2.5thinkingOpen+31%—$0.019BetterClaude Haiku 5.5low+77%—$0.024Remove sampling parameters+5

History

7 versions
2030405060Jul 25Jan 26Jul 26Release dateAA Intelligence Index 4.3.244.54.655.5
2030405060Jul 25Jan 26Jul 26Release dateAA Intelligence Index 4.3.244.54.655.5

Benchmarks

all categories
Chat & Knowledge
Humanity's Last Exam4.3
AA Omniscience Index-9
CritPt (physics)1.1
AA Intelligence Index 4.3.2≈16.6
AA Omniscience · Accuracy22.7
AA Omniscience · Hallucination Rate41
AA-LCR (long context) 1.144
MMLU-Pro · official boardlab83.7
GPQA Diamond68.3
AIME 2025 · AA archived38
Coding
Terminal-Bench Hard (version unstated)27.3
LiveCodeBench · AA archived44.9
Aider Polyglot · two attempts56.4
Agents & Tool Use
τ²-bench · AA52.3
Writing & Language
IFBench (instructions)45.4
Vision & Documents
MMMU-Pro (vision)62.4

FAQ

How much does Claude 4 Sonnet cost?›

There is no per-unit API price: not available via API.

Is Claude 4 Sonnet free to use?›

There is no free API.

What is the context window of Claude 4 Sonnet?›

1M tokens.

When was Claude 4 Sonnet released? Is there a newer version?›

Released 2025-05-22. It has been superseded by Claude Sonnet 5.5.

Is Claude 4 Sonnet open source?›

No, Claude 4 Sonnet is a closed model available through an API. The closest open-weights option here is MiMo v2.6 Pro.

Can Claude 4 Sonnet read images?›

It accepts text and images, PDF files as input.

What is Claude 4 Sonnet?›

Claude 4 Sonnet is a closed language model from Anthropic, released May 2025.

What are the best alternatives to Claude 4 Sonnet?›

GPT-6 Luna (better), MiMo v2.6 Pro (open weights).