Claude Haiku 5.5 targets fast tasks and sub-agents
Anthropic launches a new small model oriented high volumes, latency and cost, with adaptive reasoning and adjustable effort.
available
Facts, analysis and limits
Verified facts
- Model identifier: claude-haiku-5-5.
- Context of 1 million tokens and maximum output of 128,000 tokens according to API notes.
- Pricing depends on the total prompt size: up to 100,000 tokens, input is $0.10 and output $0.50 per million tokens; above that threshold, input is $0.50 and output $2.50 per million. This is not incremental pricing applied only to excess tokens.
- Available via Claude Platform and main cloud; Claude Code supports it in v2.1.293.
- Migration: old thinking/sampling/prefill parameters can cause 400 errors.
What changes
A candidate for large-scale abstracts, classifications and subtasks.
Practical implication
Test accuracy and cost per task and follow the migration guide before replacement.
Availability
Claude Platform, AWS, Google Cloud, Azure; cloud regions and contractual access to check for Belgium/EEA.
Limits and uncertainty
Official launch of 7 October, no email reception of 8. Opus/Sonnet 5.5 remain launches of September. Performances and savings announced by Anthropic.