Anthropic
Claude Sonnet 5.5
Sonnet for everyday coding and agents. Stronger results than Sonnet 5 at the same token price.
Replaces Claude Sonnet 5: same input and output price, same context window.
Run this model
anthropic/claude-sonnet-5.5
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-sonnet-5.5', messages: [{ role: 'user', content: 'Why is the sky blue?' }], max_tokens: 1024, }),}) const data = await response.json()console.log(data.choices[0].message.content)Use text or image input; PDF requests are not supported. Remove temperature and top_p when migrating. See the migration notes for native thinking and tool settings.
Model overview
- Input / 1M
- $2.1
- All-in MiniRouter rate
- Output / 1M
- $10.5
- All-in MiniRouter rate
- Context
- 1M
- 1,000,000 tokens
- Max output
- 128K
- tokens
- Terminal-Bench 4.0
- 70.6%
- Anthropic-reported
- Effort
- low → max
- five settings
- Announced
- 28 Sept 2026
- publisher release
Publisher-reported, plotted by MiniRouter
A stronger Sonnet for coding.
Compare Anthropic's launch scores. MiniRouter did not run these evaluations.
Agentic coding
Terminal-Bench 4.0
Opus 5.5 uses xhigh, its best reported effort setting.
Published score
0 to 100%
- Claude Sonnet 5.570.6%
- Claude Sonnet 510.3%
- Claude Opus 5.566.4%
View chart data
| Model | Score |
|---|---|
| Claude Sonnet 5.5 | 70.6% |
| Claude Sonnet 5 | 10.3% |
| Claude Opus 5.5 | 66.4% |
Agentic coding
CursorBench 4.0
Tasks drawn from real Cursor coding sessions.
Published score
0 to 100%
- Claude Sonnet 5.555.5%
- Claude Sonnet 534.1%
- Claude Opus 5.557.8%
View chart data
| Model | Score |
|---|---|
| Claude Sonnet 5.5 | 55.5% |
| Claude Sonnet 5 | 34.1% |
| Claude Opus 5.5 | 57.8% |
Agentic coding
FrontierCode 1.1 (Main)
Sonnet 5.5 at xhigh. Max scored 46.2%; extra work can exceed task scope.
Published score
0 to 100%
- Claude Sonnet 5.552.1%
- Claude Sonnet 542.4%
- Claude Opus 5.554.4%
View chart data
| Model | Score |
|---|---|
| Claude Sonnet 5.5 | 52.1% |
| Claude Sonnet 5 | 42.4% |
| Claude Opus 5.5 | 54.4% |
Publisher list prices
Same rates. Fewer tokens per task.
Anthropic reports up to 30% lower task cost and 30%+ faster output than Sonnet 5. Your workload and route determine the result.
Anthropic list, per 1M tokens
- Input
- $2.00
- Output
- $10.00
- Cache read
- $0.20
- 5m cache write
- $2.50
View chart data
| Rate | Sonnet 5.5 | Opus 5.5 |
|---|---|---|
| Input | $2.00 | $4.00 |
| Output | $10.00 | $20.00 |
| Cache read | $0.20 | $0.20 |
| 5m cache write | $2.50 | $5.00 |
Choose and configure
Match effort to the work.
Start at medium for defined coding tasks. Anthropic still recommends Opus 5.5 for open-ended work requiring sustained judgment.
Anthropic migration guide- 01
Review request options
The native Claude API rejects forced tool choice, thinking budgets and non-default sampling settings. Use automatic tool choice and adaptive thinking.
- 02
Replace disabled thinking
The native between_tools setting replaces disabled, at high effort or below. Higher effort requires adaptive thinking.
- 03
Preserve tool history
Keep signed thinking blocks unchanged and conversations append-only. Recheck token budgets: thinking counts toward output usage.
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-sonnet-5.5/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 | $2.1 | $10.5 | max_tokens, stop, tools, tool_choice, reasoning, include_reasoning | MiniRouter balance |