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Anthropic · Text model · GA

Claude Sonnet 5.5

US$2Input / 1M
US$10Output / 1M
1MContext
54AA index
139Tokens/s
highDefault level

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Figures checked 1 Nov 2026. A dash means not published on the sources we checked, so it stays blank rather than estimated. AA index and speed are from Artificial Analysis at the max with fallback setting.

Reasoning levels

Which level to choose

Anthropic names these settings effort. Price per token is the same at every level. Higher effort uses more tokens, so a task costs more. platform.claude.com (opens in a new tab)

LevelWhen to use it, per AnthropicAA indexTokens/s
lowMost efficient. Simpler tasks that need the best speed and lowest cost, such as subagents platform.claude.com (opens in a new tab)25 artificialanalysis.ai (opens in a new tab)105 artificialanalysis.ai (opens in a new tab)
mediumBalanced. Agentic tasks that need a balance of speed, cost and performance platform.claude.com (opens in a new tab)30 artificialanalysis.ai (opens in a new tab)101 artificialanalysis.ai (opens in a new tab)
high defaultComplex reasoning, difficult coding problems and agentic tasks platform.claude.com (opens in a new tab)41 artificialanalysis.ai (opens in a new tab)103 artificialanalysis.ai (opens in a new tab)
xhighLong-running agentic and coding tasks (over 30 minutes) with token budgets in the millions platform.claude.com (opens in a new tab)50 artificialanalysis.ai (opens in a new tab)107 artificialanalysis.ai (opens in a new tab)
maxTasks needing the deepest possible reasoning and most thorough analysis, with no limit on token spend platform.claude.com (opens in a new tab)54 artificialanalysis.ai (opens in a new tab)139 artificialanalysis.ai (opens in a new tab)

Our rule of thumb: Simple or speed-critical work: low. Standard work: the lab's default. Complex work: high. Use xhigh or max only when your own tests show a gain, as OpenAI and Anthropic both advise. developers.openai.com (opens in a new tab)platform.claude.com (opens in a new tab)

Charts

Claude Sonnet 5.5: quality at each level

Artificial Analysis Intelligence Index at each setting it tested. Levels it has not tested are left out.

Show the data as a table
LevelAA indexTokens/s
low25105
medium30101
high41103
xhigh50107
max54139
Claude Sonnet 5.5: speed at each level

Output tokens a second measured by Artificial Analysis at each setting.

Show the data as a table
LevelTokens/s
low105
medium101
high103
xhigh107
max139
Where Claude Sonnet 5.5 sits on quality against price

Highlighted point is Claude Sonnet 5.5. Grey points are the other 26 text models with both figures. Index at each model's best tested setting.

Show the data as a table
ModelIndexBlended US$/1M
GPT-6 Astra5720.000
GPT-6.1 Sol554.000
GPT-6.1 Terra512.000
GPT-6 Luna280.200
Claude Fable 5.15020.000
Claude Opus 5.5588.000
Claude Sonnet 5.5544.000
Claude Haiku 5.5360.200
Gemini 4 Carbon594.000
Gemini 4 Argon504.000
Gemini 3.8 Flash311.500
Gemini 3.5 Flash-Lite120.850
Grok 4.7353.000
Muse Wonder438.000
Mistral Large 4261.050
Mistral Small 440.262
DeepSeek V4.1 Flash 1017320.525
DeepSeek V4 Pro231.980
Qwen3.8-Max343.000
Kimi K3.1 Pro464.000
GLM-5.3322.150
GLM-5.3-Flash280.237
MiniMax M3.1 Flash290.262
MiniMax M3190.525
MiMo-V2.6-Pro300.544
MiMo-V2.6-Flash270.175
Step 5 Preview291.425
List price against similar models

US$ per 1M tokens, standard tier, short prompts. Output left blank where not published.

Show the data as a table
ModelInput US$/1MOutput US$/1M
Claude Sonnet 5.5210
GPT-6.1 Sol210
Gemini 4 Argon210
Gemini 4 Carbon210
Kimi K3.1 Pro210

Full sourced profile

LabAnthropic
TypeText
StatusGA docs.anthropic.com (opens in a new tab)
Released28 Sep 2026 models.dev (opens in a new tab)
API accessYes docs.anthropic.com (opens in a new tab)
API model IDclaude-sonnet-5-5 docs.anthropic.com (opens in a new tab)
API rate limits–
Consumer app plansFree, Pro, Max, Ultra claude.com (opens in a new tab)
Price at each levelSame per-token price at every level. platform.claude.com (opens in a new tab)
Input per 1M tokensUS$2 docs.anthropic.com (opens in a new tab)
Output per 1M tokensUS$10 docs.anthropic.com (opens in a new tab)
Cached inputUS$0.1 docs.anthropic.com (opens in a new tab)
Batch in / outUS$1 / US$5 docs.anthropic.com (opens in a new tab)
Other pricing–
Context window1M tokens docs.anthropic.com (opens in a new tab)
Max output128K tokens docs.anthropic.com (opens in a new tab)
Input typestext, image, pdf docs.anthropic.com (opens in a new tab)
Output typestext
WeightsClosed docs.anthropic.com (opens in a new tab)
ReasoningYes docs.anthropic.com (opens in a new tab)
Tool useYes docs.anthropic.com (opens in a new tab)
Artificial Analysis index54 (max with fallback) artificialanalysis.ai (opens in a new tab)
Output speed139 tokens/s artificialanalysis.ai (opens in a new tab)
Time to first token463.03 s artificialanalysis.ai (opens in a new tab)
Reasoning levelslow, medium, high (default), xhigh, max platform.claude.com (opens in a new tab)
Lab benchmark claims
Limitations
  • Anthropic says its current tokenizer produces about 30% more tokens for the same text than Claude Sonnet 4.6 and earlier

Tools and MCP connectors that fit

Anthropic: MCP connector: remote MCP servers in the Messages API platform.claude.com (opens in a new tab). These official remote MCP servers fit that rule. We have not tested each server with this model. A server that publishes a client list is left out when this lab is not on it.

Open the tool finder for Claude Sonnet 5.5

Similar alternatives

Same type, closest on quality index and blended price. A similarity, not a ranking.

Compare Claude Sonnet 5.5 with GPT-6.1 Sol and Gemini 4 Argon

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Fortune reports $542–567bn of compute commitments and a plan, "Anthropic Direct", to lease dedicated data centres whose partners secure land, power and buildings.

Source: Fortune (opens in a new tab)

Anthropic United States

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A research-preview app where Claude works as a proactive agent and checks with you before acting on your behalf.

Source: Claude on X (opens in a new tab)

Anthropic United States

Claude Haiku 5.5: up to 90% cheaper than Haiku 4.5, and faster

Anthropic's fastest model costs $0.10/$0.50 per 1M tokens for prompts up to 100k. Anthropic says it costs around 75% less to run on average.

Source: Anthropic (opens in a new tab)