Anthropic
Claude Opus 5.5
Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5.
At a glance
- Input / 1M
- $4
- Output / 1M
- $20
- Context
- 1M
- Max output
- 128K
- Intelligence
- 57.6
- Released
- Sep 2026
Pricing
Claude Opus 5.5 API pricing
Per-token rates, plus what common tasks actually cost.
| Input tokensPer 1M tokens | $4 |
|---|---|
| Output tokensPer 1M tokens | $20 |
| Cached input (read)Per 1M tokens | $0.20 |
| Cache writePer 1M tokens | $5 |
| Web searchPer request | $0.01 |
Chat message
2K in, 500 out
$18
per 1,000 requests
Coding task
30K in, 4K out
$200
per 1,000 requests
Long document summary
150K in, 2K out
$640
per 1,000 requests
Benchmarks
Claude Opus 5.5 benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
57.6
Coding index
Not available
Agentic index
Not available
Specs
Context window and capabilities
What it can read, what it can write, and which API features it supports.
- Context window
- 1M tokens
- Max output
- 128K tokens
- Input types
- File, Image, Text
- Output types
- Text
- Reasoning effort
- Max, Extra high, High, Medium, Low
- Release date
- September 22, 2026
- Tool calling
- Structured outputs
- JSON mode
- Reasoning
- Temperature
- Stop sequences
- Deterministic seed
- Verbosity control
Compare
Claude Opus 5.5 vs other models
See how Claude Opus 5.5 stacks up head to head on price, benchmarks, and features.
VSClaude Opus 5.5 vs Claude Sonnet 5.5
Anthropic vs Anthropic
See comparisonVSClaude Opus 5.5 vs Claude Fable 5.1
Anthropic vs Anthropic
See comparisonVS
Claude Opus 5.5 vs GPT-6 Astra
Anthropic vs OpenAI
See comparisonVSClaude Opus 5.5 vs GPT-6.1 Sol
Anthropic vs OpenAI
See comparisonVSClaude Opus 5.5 vs Claude Opus 5
Anthropic vs Anthropic
See comparisonVSClaude Opus 5.5 vs Claude Fable 5
Anthropic vs Anthropic
See comparisonMore Claude Opus 5.5 comparisons
- Claude Opus 5.5 vs DeepSeek V4.1 Flash
- Claude Opus 5.5 vs Muse Spark 1.3
- Claude Opus 5.5 vs GLM 5.3 Flash
- Claude Opus 5.5 vs GPT-6 Sol
- Claude Opus 5.5 vs MiMo-V2.6-Flash
- Claude Opus 5.5 vs GPT-5.6 Sol
- Claude Opus 5.5 vs Hy4 preview
- Claude Opus 5.5 vs Grok 4.7
- Claude Opus 5.5 vs GPT-6 Luna
- Claude Opus 5.5 vs DeepSeek V4 Flash 0731
- Claude Opus 5.5 vs GLM 5.3
- Claude Opus 5.5 vs Kimi K3
- Claude Opus 5.5 vs DeepSeek V4 Flash 0423
- Claude Opus 5.5 vs Step 5 Preview
- Claude Opus 5.5 vs Gemini 3.8 Flash
- Claude Opus 5.5 vs Hy3
- Claude Opus 5.5 vs Gemini 3.1 Pro Preview
Alternatives
Claude Opus 5.5 alternatives
Similar models worth considering, and where each one has the edge.
Anthropic
Claude Sonnet 5.5
OpenAI
GPT-6 Astra
OpenAI
GPT-6.1 Sol
Want to learn about other models? Browse all models
FAQ
Frequently asked questions
How much does Claude Opus 5.5 cost?
Claude Opus 5.5 costs $4 per 1M input tokens and $20 per 1M output tokens through the API. A typical chat message costs about $18 per 1,000 messages.
What is the context window of Claude Opus 5.5?
Claude Opus 5.5 accepts up to 1M tokens of input and can write up to 128K tokens in a single response.
What is the best alternative to Claude Opus 5.5?
Claude Sonnet 5.5 from Anthropic is a strong alternative. It offers: 2x cheaper output, newer release.
Can I use Claude Opus 5.5 alongside other models?
Yes. Shortcut Chat sends one prompt to Claude Opus 5.5 and any other models you pick at the same time, so you can compare answers side by side.
Try Claude Opus 5.5 next to every other model.
Use Claude Opus 5.5 alongside all the other models. Use one at a time, or multiple together. Get the best answer from every AI.