Anthropic Releases Sonnet 5.5 Model

On 28 September, TechCrunch AI and TechCrunch reported that Anthropic had released Sonnet 5.5, describing it as a significantly cheaper and faster work partner. Both also described an Opus 5.5 release with lower prices and Fable-level performance, leaving the model identity less clear than the headline suggests.

Other accounts add to the confusion. Search Engine Journal reported that Claude Sonnet 5 offers “Near-Opus Intelligence” across all plans. Wired said Anthropic, amid rapid enterprise growth, is trying to lower the barrier for businesses building AI agents with Claude. Singularity said Sonnet 5.5 is 50% cheaper and produces 62% more tokens. Another Singularity view argued that it is worse than Opus 5.5, costs more, matches Fable 5.1 pricing and is far less token-efficient, and advised users to continue with Opus. Reuters separately said Anthropic would roll out Claude Mythos in the coming weeks and had launched Opus 4.8. The tracked sources confirm the release report, while the product names and comparisons remain muddled.

Assuming the report is factual, the tracker assigns the event 0% impact. The affected groups are Anthropic customers and businesses building Claude agents. The reported changes concern price, speed, performance and token use.

Anthropic’s model documentation, pricing and availability details may establish whether the release is Sonnet 5.5, Opus 5.5 or another named version. Independent tests of speed, token efficiency and the claimed performance comparisons could also change the assessment.

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