Model specification · Anthropic
Claude Opus 5.5
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. It is particularly strong at multi-step changes in large codebases, code...
SpecificationsReported values
- Context window
- 1M
- Maximum output
- 128K
- Architecture
- text+image+file->text
- Tokenizer
- Claude
- Knowledge cutoff
- —
- Moderated
- Yes
- Input modalities
- textimagefile
- Output modalities
- text
Full pricingUSD where reported
| Price | Standard |
|---|---|
| Input | $4.00 / M |
| Output | $20.00 / M |
Benchmark indexesReported indexes
- Intelligence
- 57.6
- Coding
- —
- Agentic
- —
- Design Arena Elo
- 1387
Example workload costsStandard pricing only
| Workload | Input / output | Cache share | Estimated cost |
|---|---|---|---|
| Quick check | 10K / 1K × 1 | 0% | $0.060 |
| Long analysis | 100K / 4K × 1 | 50% | $0.290 |
| Workday | 20K / 2K × 1,000 | 30% | $97.20 |
More from AnthropicAll Anthropic models
| Model | Context | Input / M | Output / M | Intel. |
|---|---|---|---|---|
| Claude Sonnet 5.5 | 1M | $2.00 | $10.00 | 56 |
| Claude Fable 5.1 | 1M | $10.00 | $50.00 | 53.4 |
| Claude Opus 5 | 1M | $5.00 | $25.00 | 50.8 |
| Claude Fable 5 | 1M | $10.00 | $50.00 | 49.6 |
| Claude Haiku 5.5 | 1M | $0.100 | $0.500 | 43.4 |
| Claude Opus 4.8 | 1M | $5.00 | $25.00 | 41.8 |
| Claude Opus 4.7 | 1M | $5.00 | $25.00 | 40.7 |
| Claude Sonnet 5 | 1M | $2.00 | $10.00 | 38.2 |
| Claude Opus 4.6 | 1M | $5.00 | $25.00 | 31.9 |
| Claude Sonnet 4.6 | 1M | $3.00 | $15.00 | 30.1 |
| Claude Opus 4.5 | 200K | $5.00 | $25.00 | 29.1 |
| Claude Opus 4.1 | 200K | $15.00 | $75.00 | 22.8 |