---
id: "anthropic/claude-haiku-5.5"
also: ["anthropic/claude-haiku-5.5-20261007", "requesty/anthropic/claude-haiku-5-5", "vercel/anthropic/claude-haiku-5.5"]
card_usd_per_m: "0.1 in, 0.5 out, at anthropic"
cheapest_list_usd_per_m: "0.1 in, 0.5 out, at amazon-bedrock on openrouter"
cheapest_effective_usd_per_m: "0.0303 in, 0.5 out, at bedrock on requesty"
context: 1000000
max_output: 128000
input: ["text", "image", "file"]
output: ["text"]
released: "2026-10-07"
reasoning: ["max", "xhigh", "high", "medium", "low", "none"]
api: ["/api/v1/chat/completions", "/api/v1/completions", "/api/v1/messages", "/api/v1/responses"]
params: ["include_reasoning", "max_completion_tokens", "max_tokens", "reasoning", "reasoning_effort", "response_format", "stop", "structured_outputs", "tool_choice", "tools", "verbosity"]
endpoints: 21
gateways: "openrouter (10), requesty (7), vercel (4)"
no_training: 21
trains: 0
retains_prompts: 5
intelligence: 36.5000
---
# Anthropic: Claude Haiku 5.5

Claude Haiku 5.5 brings adaptive reasoning to Anthropic’s low-cost Haiku family for everyday tasks, tool use, and scaled sub-agent deployments. It is the first Haiku with adjustable effort levels, letting developers balance reasoning depth and token usage for each task, with the option to turn thinking off for simpler requests.