September 22, 2026
Claude Opus 5.5 work got cheaper: Anthropic promises 40% savings
On September 22, 2026, Anthropic made Claude Opus 5.5 available through its API: one million input tokens cost $4, and one million output tokens cost $20.
Claude
@claudeai
Introducing Claude Opus 5.5, the first model in the new Claude 5.5 family. For most tasks, it performs at the level of Claude Fable 5.1, while costing 40% less than Opus 5.
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Previously, Opus 5 cost $5 per million input tokens and $25 per million output tokens. Now Opus 5.5 costs $4 and $20. Anthropic says that for most tasks, the model performs at the level of Claude Fable 5.1, costs 40% less than Opus 5, and returns answers more than 30% faster.
Project migration. Direct calls require a Claude Console account and an API key: after `pip install anthropic`, specify `model="claude-opus-5-5"` in the request. In Claude Code, Anthropic suggests the command `/claude-api migrate this project to claude-opus-5-5`. During migration, remove `thinking` settings: in Opus 5.5, it is always enabled, while depth is set through `output_config.effort`, with `medium` as the default instead of `high`.
Call settings. Forced tool invocation through `tool_choice` with the values `any` and `tool` will now return 400. Anthropic recommends `auto` together with strict tool use or structured outputs.
The model is available through Claude API, Amazon Bedrock, Google Cloud, Microsoft Foundry, and Claude Platform on AWS. The context window holds 1 million tokens, the standard maximum output is 128K, and the Batch API beta supports up to 300K. Cache read costs $0.20 per million tokens, cache write for 5 minutes costs $5, and for an hour costs $8; Batch API cuts input and output token prices by 50%.
Claude Opus 5.5 became the first model in the new Claude 5.5 family.
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