Anthropic's Claude Opus 5.5 Offers Fable-comparable Performance at Reduced Costs

WHO:

Mashable - Anthropic is the organization launching Claude Opus 5.5.

Techmeme - Matthias Bastian is a contributor to the article discussing the launch.

WHAT:

MarkTechPost - Claude Opus 5.5 is the first model in the new Claude 5.5 family.

MarkTechPost - On Anthropic's own benchmarks, Claude Opus 5.5 leads in agentic coding.

Mashable - Claude Opus 5.5 is launched by Anthropic.

Mashable - Claude Opus 5.5 rivals Fable 5.1 on most work.

Techmeme - Opus 5.5 costs $4 per 1 million input tokens and $20 per 1 million output tokens.

Techmeme - Opus 5.5 is said to cost about 40% less to run than Opus 5.

WHY:

Mashable - The launch of Claude Opus 5.5 includes tougher safeguards compared to previous versions.

HOW:

Techmeme - Anthropic claims that Opus 5.5 matches Claude Fable 5.1 "on most tasks."

(UPDATED September 22, 2026 20:01 UTC)

Claude Opus 5.5 has just been unveiled as the first model in the new Claude 5.5 family. According to Anthropic's own benchmarks, this latest model excels in agentic coding. This development marks a significant advancement in the capabilities of AI technology.

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(UPDATED September 22, 2026 19:02 UTC)

Anthropic has officially launched Claude Opus 5.5, which is said to rival Claude Fable 5.1 on most tasks while incorporating tougher safeguards compared to earlier versions. The new model is priced at $4 per million input tokens and $20 per million output tokens, and it reportedly costs about 40% less to run than its predecessor, Opus 5. President Trump is mentioned in an article by Matthias Bastian discussing this significant launch.