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Claude Sonnet 5.5 (Xhigh, Default Fallback)
Anthropic · Released 2026-09-28 · Independent benchmark scores from Artificial Analysis
Intelligence Index
51.9
Output speed
103.3
tokens/sec
Blended price
$4.00
per 1M tokens
Time to first token
19.88s
Model metadata
| Model ID | 975aeaef-50bd-4a65-9c73-f1015adcd4d4 |
|---|---|
| Slug | claude-sonnet-5-5-xhigh |
| Release date | 2026-09-28 |
| Provider | Anthropic |
| Provider slug | anthropic |
| Output speed | 103.3 tok/s |
| Time to first token | 19.88s |
| Time to first answer | 19.88s |
| Blended price ($/1M) | $4.00 |
| Input price ($/1M) | $2.00 |
| Output price ($/1M) | $10.00 |
All evaluation scores (18)
| aime | — |
|---|---|
| aime 25 | — |
| artificial analysis coding index | — |
| artificial analysis intelligence index | 51.90 |
| artificial analysis math index | — |
| gpqa | — |
| hle | 50.0% |
| ifbench | — |
| lcr | 79.7% |
| livecodebench | — |
| math 500 | — |
| mmlu pro | — |
| scicode | 57.3% |
| tau banking | — |
| tau2 | — |
| terminalbench hard | — |
| terminalbench v2 1 | — |
| terminalbench v4 0 | 57.1% |
Source: artificialanalysis.ai/models/claude-sonnet-5-5-xhigh
Benchmark data from Artificial Analysis.