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Step 5 Preview
Claude Haiku 5.5
Claude Haiku 5.5 is a proprietary model from Anthropic, released Oct 7, 2026. It ranks #153 of 351 on the LMArena text leaderboard with a rating of 1401, and #12 of 27 on the Vals Index with 58.71%. It costs $0.10 per million input tokens and $0.50 per million output tokens, with a 1M-token context window.
- Developer
- Anthropic
- Released
- Oct 7, 2026
- Context window
- 1M
- Price in / out, per 1M tokens
- $0.10 / $0.50
- Weights
- Proprietary
- Inputs
- Text, Images, Files
- Reasoning
- Yes
- Tool use
- Yes
Benchmarks
| Benchmark | Score bar | Accuracy | Rank | Cost / test |
|---|---|---|---|---|
| Vals IndexVals AI | 58.71% | 12 / 27 | $3.17 | |
| Terminal-Bench 4.0Coding | 36.36% | 17 / 55 | $3.12 | |
| Vibe Code BenchCoding | 90.44% | 3 / 115 | $6.07 | |
| Code MigrationCoding | 52.36% | 13 / 28 | $6.20 | |
| Finance AgentFinance | 65.37% | 8 / 31 | $1.64 | |
| Finance IndexFinance | 57.45% | 14 / 31 | $1.39 | |
| Tax Agent BenchFinance | 31.92% | 23 / 76 | $1.16 | |
| Legal IndexLaw | 70.27% | 13 / 28 | $2.35 | |
| Legal Research BenchLaw | 43.27% | 24 / 85 | $1.63 | |
| MedCodeMedicine | 51.54% | 15 / 107 | $0.1 / $0.5 | |
| Terminal-Bench ScienceReasoning | 10.00% | 17 / 42 | $4.52 |
Vals AI, as of Oct 24, 2026.
LMArena, by category
| Leaderboard | Rating | Rank | Votes |
|---|---|---|---|
| TextLMArena | 1401 | 153 / 351 | 6.1K |
| CodingLMArena | 1450 | 101 / 346 | 1.4K |
| MathLMArena | 1413 | 139 / 339 | 344 |
| Creative writingLMArena | 1336 | 185 / 349 | 1.4K |
| Instruction followingLMArena | 1416 | 95 / 351 | 2.1K |
| Hard promptsLMArena | 1421 | 133 / 351 | 3.7K |
| Multi-turnLMArena | 1396 | 159 / 349 | 927 |
| Long queriesLMArena | 1399 | 152 / 330 | 2.7K |
| ExpertLMArena | 1448 | 85 / 305 | 617 |
| Legal and governmentIndustries | 1395 | 164 / 325 | 487 |
| Medicine and healthcareIndustries | 1372 | 187 / 325 | 424 |
| Business and financeIndustries | 1406 | 129 / 344 | 1K |
| ChineseLanguages | 1431 | 151 / 328 | 506 |
| SpanishLanguages | 1385 | 165 / 249 | 244 |
| FrenchLanguages | 1441 | 104 / 252 | 255 |
| WebDevLMArena | 1586 | 35 / 124 | 3.9K |
LMArena, CC BY 4.0, as of Oct 22, 2026. Where a model is rated at several effort levels, its best is shown.
Compare Claude Haiku 5.5
Anthropic
An AI safety and research company that builds the Claude family of models, known for coding, long context and careful behaviour. Founded 2021, based in San Francisco. anthropic.com
Questions
Who makes Claude Haiku 5.5?
Claude Haiku 5.5 is made by Anthropic, founded 2021 and based in San Francisco.
How much does Claude Haiku 5.5 cost?
$0.10 per million input tokens and $0.50 per million output tokens, at its provider’s list price.
What is Claude Haiku 5.5’s context window?
1M tokens (1,000,000).
How does Claude Haiku 5.5 rank?
#153 of 351 on LMArena’s text leaderboard, rated 1401 (95% interval 1392–1409) from 6,080 votes, as of Oct 22, 2026.
Is Claude Haiku 5.5 open source?
No. Claude Haiku 5.5 is proprietary and served through its provider’s API.