# Claude Opus 5.5 is now available on B.AI, with API and Web Chat opening together

B.AI now offers Claude Opus 5.5. According to B.AI, the model supports a 1M-token context and up to 128K output, matches Claude Fable 5.1 on most tasks, and costs about 40% less to run than Opus 5.

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Current time (UTC, cached as of): 2026-11-10T07:31:00.000Z
Query date (America/Los_Angeles): 2026-11-09

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Source: B.AI · Published 9/23/2026, 01:27:10

Claude Opus 5.5 is now available on [B.AI](http://B.AI), with the API and [Web Chat](https://chat.b.ai/chat) opening at the same time. Model details are in the [Claude Opus 5.5 documentation](https://docs.b.ai/zh-Hans/llmservice/models/claude-opus-5.5).

B.AI says the model is the first in AnthropicAI’s newly released Claude 5.5 series, built for long-running agent coding and complex knowledge work. On most tasks it reaches Claude Fable 5.1 performance, costs about 40% less to run than Opus 5, and supports a 1M-token context with up to 128K output. B.AI also says the model shows leading capability in Computer Use and multi-step automation.

Tags: Claude Opus, B.AI, AnthropicAI, Model launch

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