List price
Input / 1M$4.00Output / 1M$20.00Cache read / 1M$0.20Blended$16.000Value index193.2Last move—
models.dev · MIT · retrieved Oct 24, 2026
Anthropic
Claude Opus 5.5
Claude Opus 5.5 is listed by Anthropic at $4 input and $20 output per million tokens. The recorded context window is 1,000,000 tokens. Release date on file: 2026-09-22. LMArena's text board published 2026-10-20 gives it an overall rating of 1516.2 (rank 2, 9,496 votes). Price source: models.dev (MIT).
- Context95
- Inverse price97
- Arena96
- GPQA93
- Tools100
- Modalities67
Price history
Input and output list price. A missing day stays a gap in the line. The series is not a quality history.
Benchmarks
LMArena is CC-BY-4.0. Epoch scores, including LiveBench where Epoch publishes it, are CC-BY-4.0. A blank cell means this snapshot has no match. Nothing here is estimated.
| Benchmark | Score | Detail | Source |
|---|---|---|---|
| LMArena overall | 1516.2 | rank 2 · 9,496 votes | LMArena leaderboard dataset · CC-BY-4.0 |
| LMArena coding | 1545.0 | rank 2 · 2,143 votes | LMArena leaderboard dataset · CC-BY-4.0 |
| LMArena math | 1517.7 | rank 6 · 491 votes | LMArena leaderboard dataset · CC-BY-4.0 |
| GPQA Diamond | 90.6% | — | Epoch AI Capabilities & benchmarking · CC-BY-4.0 |
| LiveBench | — | — | — |
| SWE-bench Verified | — | — | — |
| Epoch Capability Index | 168.83 | 165.25–173.95 | Epoch AI Capabilities & benchmarking · CC-BY-4.0 |
Provider prices
The list row is the price used for the value index. Other rows are the same model id on models.dev, plus the LiteLLM catalog price when we have one. A split quote is kept beside the list price.
| Quote | Provider | Input / 1M | Output / 1M | Blended | Source |
|---|---|---|---|---|---|
| List | Anthropic | $4.00 | $20.00 | $16.000 | models.dev · MIT |
| Also listed | Standard Compute | $4.00 | $20.00 | $16.000 | models.dev · MIT |
| Also listed | Merge Gateway | $4.00 | $20.00 | $16.000 | models.dev · MIT |
| Also listed | AI/ML API | $4.00 | $20.00 | $16.000 | models.dev · MIT |
| LiteLLM | anthropic | $4.00 | $20.00 | $16.000 | LiteLLM model_prices_and_context_window.json · MIT |
Spec
Context1,000,000Max output128,000Inputtext, image, pdfOutputtextReleased2026-09-22Open weightsNo
Spec fields are from the models.dev row for Anthropic.