Source

Anthropic API Release Notes

1 item

Anthropic's own record of what changed in the API, dated entry by dated entry. Where a claim about a model, a limit, or an endpoint is settled.

platform.claude.com ↗

The words Claude Haiku 5.5 in black serif type on an off-white background, between three torn paper fragments in yellow, beige, and blue, with a thin black arc running beneath the name.

Models

Claude Haiku 5.5 cuts Anthropic's small-model price by 90% for prompts under 100,000 tokens

Anthropic released Claude Haiku 5.5 on October 7, 2026. For prompts up to 100,000 tokens it costs $0.10 per million input tokens and $0.50 per million output tokens, a tenth of what Haiku 4.5 charges; above that line the prices are $0.50 and $2.50. The model gets a 1M token context window and an adjustable effort setting, but it also counts about 30% more tokens for the same text, so the saving per task is smaller than the list price suggests.

AnthropicOctober 8verified