Claude Opus 5.5 Fast

Claude Opus 5.5 Fast is a model from Anthropic. AnonRouter provides access through the serving providers listed above.

The catalog lists September 26, 2026 as its release date.

Listed input rates are $8.00; output rates are $40.00, per million tokens. Rates and cache discounts vary by provider. Check the Providers section for the route you choose.

The model catalog lists a context window of 1,000,000 tokens and up to 128,000 output tokens. Individual providers can have lower limits; check their rows in the Providers section.

Yes. The catalog lists these modalities: text, image. Available inputs and outputs depend on the serving route.

Tool calling is advertised for this model. Reasoning is also advertised; available controls vary by provider.

Currently callable routes offer these privacy levels: Anonymous. Privacy depends on the provider route. Check the privacy badge and route details before choosing a provider; the Privacy section explains the strongest available level.

Open it in Chat, or use the Quickstart button above for an API example with this model's ID, anthropic/claude-opus-5.5-fast. Available interfaces depend on the model's modality and provider.