Claude Haiku 5.5 announced
Oct 7, 2026
Anthropic's cheapest, fastest small model: roughly 75% lower average running cost than Haiku 4.5, with a 1M-token context window.
Source: Anthropic, via 9to5Mac
AI Lab
Anthropic
AI safety research + frontier Claude models
| Founded | 2021 |
| Headquarters | San Francisco, CA, USA |
| Founders | Dario Amodei, Daniela Amodei |
| Focus | AI safety research + frontier Claude models |
| Official site | https://www.anthropic.com |
| Data verified | Oct 14, 2026 |
95.8Club Score (#1)
Claude Fable 5.1Best model (97)
4Models tracked (squad)
Claude Haiku 5.5Cheapest capable ($0.20/1M blended)
Claude Haiku 5.5Latest release (Oct 7, 2026)
0%Open-weight share (Closed)
Models & league positions
| Model | Score | Overall | Coding | Reasoning | Value | Open-Wt | Context | $/1M in | $/1M out | Released |
|---|---|---|---|---|---|---|---|---|---|---|
| Claude Fable 5.1 | 97 | #1 | — | #5 | #27 | — | 1M | $10.00 | $50.00 | Sep 1, 2026 |
| Claude Opus 5.5 | 96 | #3 | — | — | #20 | — | 1M | $4.00 | $20.00 | Sep 22, 2026 |
| Claude Sonnet 5.5 | 87 | #7 | — | — | #14 | — | 1M | $2.00 | $10.00 | Sep 28, 2026 |
| Claude Haiku 5.5 | 68 | #17 | — | — | #1 | — | 1M | $0.10 | $0.50 | Oct 7, 2026 |
Latest releases
- Oct 7, 2026: Claude Haiku 5.5 — Released — 1M context, $0.10/$0.50 per 1M, League Score 68. Model release
- Oct 7, 2026: Claude Haiku 5.5 — Claude Haiku 5.5 released by Anthropic — added to the database. Added to database
- Oct 7, 2026: Anthropic — Claude Haiku 5.5 announced — Anthropic's cheapest, fastest small model: roughly 75% lower average running cost than Haiku 4.5, with a 1M-token context window. Research
- Sep 28, 2026: Claude Sonnet 5.5 — Released — 1M context, $2.00/$10.00 per 1M, League Score 87. Model release
- Sep 22, 2026: Claude Opus 5.5 — Released — 1M context, $4.00/$20.00 per 1M, League Score 96. Model release
Research highlights
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