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Claude Haiku 5.5

Claude Haiku 5.5 is a model from Anthropic, released October 7, 2026. It ranks #16 of 45 models on the Vals Index with 54.31%. Its best result is #3 of 110 on Vibe Code Bench v1.1.

Release Date: Oct 7, 2026

Developer Anthropic  🇺🇸
Context Window 1M
Max Output Tokens 128k
Token Costs (in/out) $0.10/0.50
Weights Private
Input Modalities

Accuracy

54.31 % ± 1.41

Cost / Test (Vals Index)

$ 2.991

Latency

47 min 17 s

Fallback Rate 0.00%
Refusal Rate 0.22%
Vals Index
BenchmarksAccuracyRankings
Vals Index

54.31%

±1.41
16/45
EMB

59.02%

±4.17
34/72
Finance Agent (v2)

54.14%

±2.13
24/76
Legal Research Bench

43.27%

±3.44
20/75
ProofBench v1.1

86.00%

±3.49
10/48
Tax Agent Bench

62.20%

±3.22
30/67
Vibe Code Bench v1.1

90.44%

±1.73
3/110
Harvey's Legal Agent Benchmark

1.25%

±0.72
54/76
IOI

47.28%

±10.72
27/42
Terminal-Bench 4.0

35.35%

±2.20
12/45
Proprietary BenchmarksAcademic BenchmarksIndustry Partners
Vals
Default Provider : Anthropic
Temperature: 1
Top P: Default
Top K: Default
Max Output Tokens: 128,000
Compute Effort: max