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Claude

Claude Opus 5.5: Online Chat & API

claude-opus-5-5

Anthropic's newest frontier flagship — the strongest Claude ever shipped, for the problems nothing else can solve. 1M-token context.

🔥 10% below the official Anthropic API
Input $3.6 vs $4 /1M official
Output $18 vs $20 /1M official
Input $3.6 · Output $18 /1M tokens1M context Thinking Prompt caching
claude-opus-5-5

Try it right here

Real model, streaming live — free trial credits on sign-up

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About Claude Opus 5.5

Claude Opus 5.5 is the new top of the Claude line: Anthropic's most capable model to date, pushing the frontier on coding, research-grade reasoning and long-horizon agentic work.

It carries a 1M-token context window and adaptive thinking — the model gauges each request and reasons as deeply as the task demands. Prompt caching keeps sustained agent workloads economical despite flagship positioning.

On Foxwire you can use Claude Opus 5.5 two ways with one account and one credit balance: chat in the browser playground on this page, or call it programmatically through an OpenAI-compatible endpoint. Pricing is pure pay-as-you-go per token with no subscription.

Why Claude Opus 5.5

The strongest Claude

Anthropic's newest frontier model — measurable gains over Opus 4.8 on the hardest coding and reasoning benchmarks.

Adaptive thinking

Reasoning depth scales automatically with difficulty, identical to the official API.

OpenAI-compatible API

Point your existing OpenAI SDK at our base URL and it just works — streaming, tool calling, usage accounting included. Anthropic-native /v1/messages is supported too.

Prompt caching, up to 90% off

Mark stable context (system prompts, tools, documents) with cache_control and repeated tokens are billed at a fraction of the input price.

One balance for everything

Web chat and API share the same credit balance and transparent per-token pricing. No subscription, no minimums.

Specifications

Model IDclaude-opus-5-5
FamilyClaude
TypeLLM
Context window1M tokens
Input price$3.6 / 1M tokens
Output price$18 / 1M tokens
Cache read price$0.18 / 1M tokens
Thinking / reasoningYes
Prompt cachingYes
API compatibilityOpenAI SDK + Anthropic /v1/messages
StreamingYes

Integrate in three steps

1

Create an API key

Sign up, open the console and issue a key — free trial credits are included, no card required.

2

Point your SDK at Foxwire

Set the base URL to our endpoint and pass model \"claude-opus-5-5\". Existing OpenAI SDK code needs no other changes.

3

Ship and monitor

Stream responses in production and track every request's tokens and cost in the usage logs.

Frequently asked questions

Can I try Claude Opus 5.5 without writing code?+

Yes — the playground on this page is the real model. Sign up, get trial credits and chat instantly; the same account later works for the API.

Is the API compatible with the OpenAI SDK?+

Yes. Use any OpenAI SDK (Python, Node, etc.) with our base URL, or call the Anthropic-native /v1/messages endpoint — both are supported with streaming.

How does pricing work?+

Pure pay-as-you-go per token, shown on this page and billed from your credit balance (1 credit = $0.01). Cache hits are billed at a heavily discounted rate. No subscription.

Does it support thinking / reasoning?+

Yes — adaptive thinking. Opus 5.5 decides how deeply to reason for each request, exactly like the official API.

What is the context window?+

1M tokens — entire codebases, research corpora and very long agent sessions.