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by Anthropic

Anthropic: Claude Sonnet 5.5.

multimodal closed 1M ctx
Cheapest input
$2.0/M
on DeepInfra
Cheapest output
$10.0/M
on DeepInfra
Hosted equiv.
~$3.6/hr
@ 100 tok/s on DeepInfra

Claude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, succeeding Claude Sonnet 5 as a direct upgrade. It is especially strong at building features, fixing bugs, and producing...

Hosted API only

No self-host path — closed weights.

Anthropic: Claude Sonnet 5.5's weights aren't published. Use it via the access providers below.

Where to use it

Cheapest hosted endpoints.

Provider Access $/M in $/M out
DeepInfra hosted inference $2.0 $10.0 Launch ↗
OpenRouter api aggregator $2.0 $10.0 Launch ↗
FAQ

Frequently asked.

How do I run Anthropic: Claude Sonnet 5.5?
Anthropic: Claude Sonnet 5.5 is a closed-source API model. The cheapest way to access it is through the API providers listed on this page (direct API, aggregators, and hosted chat UIs).
Where can I access Anthropic: Claude Sonnet 5.5?
Anthropic: Claude Sonnet 5.5 is available via DeepInfra, OpenRouter. Each access option lists its own pricing (per million tokens or hourly hosting).
How much does it cost to run Anthropic: Claude Sonnet 5.5?
API pricing starts at $2.0/M input tokens and $10.0/M output tokens. Self-hosting cost depends on the GPU you rent — see the Run It Yourself tab.
Is Anthropic: Claude Sonnet 5.5 open-source or proprietary?
Anthropic: Claude Sonnet 5.5 is a proprietary model from Anthropic. Access is API-only — there are no public weights to download.