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Anthropic

Claude Haiku 5.5

Claude Haiku 5.5 is a Anthropic model with 1M context, $0.10 in / $0.50 out per million tokens, last verified October 25, 2026. Open weights: not verified. Public-board scores are linked to the publisher; vendor-only figures stay in the watch-out, not on the board.

Anthropic positions Haiku 5.5 for high-volume classification, extraction, routing and subagent tasks, with adaptive thinking and a 1M-token context window.

Recorded profile verification October 25, 2026Individual provider fields may change

AI model specification details
SpecificationClaude Haiku 5.5
ProviderAnthropic
TierBudget
Context window1M
Max output128K
Input / 1M tokens$0.10
Output / 1M tokens$0.50
WeightsNot verifiedUnverified
ParametersNot verifiedUnverified
Reasoning levelsNot verifiedUnverified
Modalitiestext, image
API model idclaude-haiku-5-5
ReleasedOctober 7, 2026

Pricing tiers: Base rates apply to prompts up to 100,000 tokens. Above 100,000 tokens, input is $0.50 and output $2.50 per MTok. Cache reads are $0.01/$0.05; 5-minute writes $0.125/$0.625 and 1-hour writes $0.20/$1 for short/long prompts. Batch input/output receives a 50% discount. Standard output is 128K; 300K Batch output requires the documented beta header. Adaptive thinking defaults to medium effort.

Best for

  • Classification and extraction
  • Routing
  • High-volume subagent tasks

Watch out

Prices increase fivefold above 100K prompt tokens. The newer tokenizer counts approximately 30% more tokens than Haiku 4.5 for the same text. Omit temperature, top_p and top_k. Thinking blocks are reusable only in the producing account or a linked account. Parameter count and weight availability remain unverified; no predecessor benchmark scores are inherited.

History

Claude Haiku 5.5 timeline

Release and status events for this model that passed two-source verification — dated, sourced, and linked.

  • Claude Haiku 5.5ReleaseOctober 7, 2026

    Anthropic lists Haiku 5.5 as released October 7, with adaptive thinking and a 1M-token context window.

    Anthropic Haiku 5.5 specifications

Source receipts

Catalog figures for this model were checked against the following sources.

Common questions

Claude Haiku 5.5

Answered from the verified figures on this page rather than general guidance.

How much does Claude Haiku 5.5 cost per million tokens?
Claude Haiku 5.5 lists base rates of $0.10 per million input tokens and $0.50 per million output tokens. Estimate both input and output token volume and any additional charges for your workload. Base rates apply to prompts up to 100,000 tokens. Above 100,000 tokens, input is $0.50 and output $2.50 per MTok. Cache reads are $0.01/$0.05; 5-minute writes $0.125/$0.625 and 1-hour writes $0.20/$1 for short/long prompts. Batch input/output receives a 50% discount. Standard output is 128K; 300K Batch output requires the documented beta header. Adaptive thinking defaults to medium effort.
What is Claude Haiku 5.5's context window?
Claude Haiku 5.5 accepts about 1M tokens of context. That only matters if you routinely send very long documents, large codebases, or multi-turn histories that approach that limit.
What is Claude Haiku 5.5 best for?
Claude Haiku 5.5 is a budget tier from Anthropic. It suits classification and extraction, routing, high-volume subagent tasks. Prices increase fivefold above 100K prompt tokens. The newer tokenizer counts approximately 30% more tokens than Haiku 4.5 for the same text. Omit temperature, top_p and top_k. Thinking blocks are reusable only in the producing account or a linked account. Parameter count and weight availability remain unverified; no predecessor benchmark scores are inherited.
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