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Models739Deals30d266Policy30d65, 15 pendingSources1,010

Sonnet 5.5

AnthropicReleased Sep 28, 2026Current

Score basis

Sonnet 5.5 is capable in math and coding and behind the leaders in reasoning. Too few results yet to rate agentic tasks, safety, long context, multimodal tasks, multilingual tasks, instruction following, or factuality.

Capability profile

Bars show the model's median result as a share of the leading model's, per capability. Select a row to see its results.

Capable2 capabilities
  1. Math−17.1%3 of 5
  2. Coding−21.5%5 of 10
Limited1 capability
  1. Reasoning−26.6%3 of 6
Not rated7 capabilities

Too few results yet to rate Agentic, Safety, Long Context, Multimodal, Multilingual, Instruction Following or Factuality.

Price

$2.00input$10.00outputper million tokens

From Anthropic's own price page · 3 providers tracked · All prices

Costs more than 82% of 328 priced models · 3:1 input-to-output blend, log scale

Evidence

76results on58benchmarks

  • 23 independently verified
  • 25 vendor-reported
  • 28 cross-referenced

From 16 sources · latest Oct 7, 2026 · How verification works

API features

Tool callingStructured outputsReasoning

As listed by OpenRouter

Research

2 papers reference Sonnet 5.5

Sonnet 5.5 benchmark results

76 results on 58 benchmarks, grouped by capability. Each bar is the result as a share of the capability leader's; every result links to its source.

Math

CapableFull math ranking

17.1% behind the leader3 of 5 ranked benchmarks measured

Show 1 more math resultHide 1 math result

Coding

CapableFull coding ranking

21.5% behind the leader5 of 10 ranked benchmarks measured

Show 5 more coding resultsHide 5 coding results

Reasoning

LimitedFull reasoning ranking

26.6% behind the leader3 of 6 ranked benchmarks measured

Show 2 more reasoning resultsHide 2 reasoning results

Multimodal

Not enough dataFull multimodal ranking

0 of 6 ranked benchmarks measured

Instruction Following

Not enough dataFull instruction following ranking

0 of 3 ranked benchmarks measured

Factuality

Not enough dataFull factuality ranking

0 of 4 ranked benchmarks measured

More results

Benchmarks outside the capability baskets. They are not ranked against a leader.

Show 47 more resultsHide 47 results

Sonnet 5.5: common questions

Who makes Sonnet 5.5?

Sonnet 5.5 is made by Anthropic.

When was Sonnet 5.5 released?

Sonnet 5.5 was released on Sep 28, 2026, according to Anthropic's own announcement.

What is Sonnet 5.5 good at?

Sonnet 5.5 is capable in math and coding and behind the leaders in reasoning. Too few results yet to rate agentic tasks, safety, long context, multimodal tasks, multilingual tasks, instruction following, or factuality.

How much does Sonnet 5.5 cost?

Sonnet 5.5 costs $2.00 per million input tokens and $10.00 per million output tokens, according to Anthropic's own price page. We track its price at 3 providers. At a mix of three input tokens to one output token, it costs more than 82% of the 328 priced models we track.

How many benchmarks has Sonnet 5.5 been tested on?

We track 76 results for Sonnet 5.5 on 58 benchmarks from 16 sources, 23 of them independently verified. The latest was recorded on Oct 7, 2026.

Which API features does Sonnet 5.5 support?

OpenRouter lists tool calling, structured outputs, and reasoning for Sonnet 5.5.

About this record

Where Sonnet 5.5's numbers come from, and every name it appears under.

Tracked since
Aug 10, 2026
Newest source mention
Oct 2, 2026

Where the results come from

Verification: 76 scores · 23 independently verified · 28 vendor cross-reference · 25 vendor-reported. How these tiers are assigned

From 16 sources on 9 sites. www-cdn.anthropic.com supplies 33 of them; the 23 independently verified results come from 6 sites. Bars are coloured by trust tier.

  • www-cdn.anthropic.com33
  • api.llm-stats.com16
  • livebench.ai14
  • anthropic.com4
  • datasets-server.huggingface.co3
  • epoch.ai3
  • artificialanalysis.ai1
  • lmarena.ai1
  • simple-bench.com1

Also known as

How our sources name Sonnet 5.5 at each reasoning setting.

SettingShort formAPI id
low—claude-sonnet-5-5-low
medium—claude-sonnet-5-5-medium
high—claude-sonnet-5-5-high claude-sonnet-5.5-high
xhigh—claude-sonnet-5-5-xhigh claude-sonnet-5.5-xhigh
maxclaude sonnet 5.5 (max)—
Also listed asclaude sonnet 5.5claude-sonnet-5-5