Anthropic
Claude Opus 5.5 Fast
Opus 5.5 in fast mode. Same model, up to 2.5x faster output, at twice the price.
Replaces Claude Opus 5 (Fast): input $10.5 → $8.4 per 1M (-20%), output $52.5 → $42 per 1M (-20%), same context window.
Run this model
anthropic/claude-opus-5.5-fast
Use an endpoint supported by this model.
Get a key for this setup →const response = await fetch('https://api.minirouter.sh/v1/chat/completions', { method: 'POST', headers: { Authorization: `Bearer ${process.env.MINIROUTER_KEY}`, 'Content-Type': 'application/json', }, body: JSON.stringify({ model: 'anthropic/claude-opus-5.5-fast', messages: [{ role: 'user', content: 'Why is the sky blue?' }], max_tokens: 1024, }),}) const data = await response.json()console.log(data.choices[0].message.content)Model overview
- Input / 1M
- $8.4
- All-in MiniRouter rate
- Output / 1M
- $42
- All-in MiniRouter rate
- Context
- 1M
- 1,000,000 tokens
- Max output
- 128K
- tokens
- Speed
- Up to 2.5x
- Anthropic's claim versus Opus 5.5
- Price
- 2x Opus 5.5
- $8 in, $40 out per 1M
- Announced
- 22 Sept 2026
- publisher release
Publisher-reported, plotted by MiniRouter
Opus 5.5's scores, served faster.
Fast mode serves the same model, so these are Opus 5.5's results.
Anthropic-reported
Coding, agents, knowledge work
- Claude Opus 5.5
- Comparison models
Agentic coding
Terminal-Bench 4.0
- Claude Opus 5.566.4%
- Claude Fable 5.155.8%
- Claude Opus 552.3%
- GPT-6 Astra57.9%
0 to 100%
Coding
FrontierCode v1.1
- Claude Opus 5.554.4%
- Claude Fable 5.150.3%
- Claude Opus 548.0%
- GPT-6 Astra53.3%
0 to 100%
Agentic coding
CursorBench 4.0
- Claude Opus 5.557.8%
- Claude Fable 5.151.8%
- Claude Opus 546.6%
- GPT-6 Astra—Not reported
0 to 100%
Knowledge work
GDPval-AA v2.1 (Elo)
- Claude Opus 5.51,846
- Claude Fable 5.11,735
- Claude Opus 51,708
- GPT-6 Astra1,542
1,500 to 1,900 Elo
Business workflows
AutomationBench
- Claude Opus 5.540.0%
- Claude Fable 5.131.4%
- Claude Opus 526.9%
- GPT-6 Astra41.4%
0 to 100%
Reasoning
Humanity's Last Exam · with tools
- Claude Opus 5.567.7%
- Claude Fable 5.165.6%
- Claude Opus 563.6%
- GPT-6 Astra57.2%
0 to 100%
Agentic research
Terminal-Bench-Science 0.1
- Claude Opus 5.558.7%
- Claude Fable 5.152.6%
- Claude Opus 529.0%
- GPT-6 Astra64.6%
0 to 100%
Computer use
OSWorld 2.0 · partial
- Claude Opus 5.581.8%
- Claude Fable 5.180.7%
- Claude Opus 574.0%
- GPT-6 Astra—Not reported
0 to 100%
View chart data
| Benchmark | Claude Opus 5.5 | Claude Fable 5.1 | Claude Opus 5 | GPT-6 Astra |
|---|---|---|---|---|
| Terminal-Bench 4.0 | 66.4% | 55.8% | 52.3% | 57.9% |
| FrontierCode v1.1 | 54.4% | 50.3% | 48.0% | 53.3% |
| CursorBench 4.0 | 57.8% | 51.8% | 46.6% | Not reported |
| GDPval-AA v2.1 (Elo) | 1,846 | 1,735 | 1,708 | 1,542 |
| AutomationBench | 40.0% | 31.4% | 26.9% | 41.4% |
| Humanity's Last Exam · with tools | 67.7% | 65.6% | 63.6% | 57.2% |
| Terminal-Bench-Science 0.1 | 58.7% | 52.6% | 29.0% | 64.6% |
| OSWorld 2.0 · partial | 81.8% | 80.7% | 74.0% | Not reported |
When it pays off
Pay for speed only where you wait.
Route interactive turns here and background work to Opus 5.5.
Claude Opus 5.5Anthropic list, per 1M tokens
- Input
- $8.00$4.00 standard
- Output
- $40.00$20.00 standard
View chart data
| Rate | Opus 5.5 | Opus 5.5 Fast | Opus 5 |
|---|---|---|---|
| Input | $4.00 | $8.00 | $5.00 |
| Output | $20.00 | $40.00 | $25.00 |
| Cache read | $0.20 | $0.40 | $0.50 |
| Cache write | $5.00 | $10.00 | $6.25 |
One route, standard clients.
Authenticate with a MiniRouter bearer key. Caller-provided upstream credentials are not used on this route.
Read model setup docs →https://api.minirouter.sh/v1anthropic/claude-opus-5.5-fast/v1/chat/completions/v1/messages/v1/responsesmax_tokens, stop, tools, tool_choice, reasoning, include_reasoning
Not enforced; a requested format is dropped and the answer is plain text.
Configured provider
Priority follows the live catalog order.
Input: text, image · Output: text
| Provider | Priority | Input / 1M | Output / 1M | Parameters | Access |
|---|---|---|---|---|---|
vercel | 1 | $8.4 | $42 | max_tokens, stop, tools, tool_choice, reasoning, include_reasoning | MiniRouter balance |