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Long context

Claude Sonnet 5.5 API pricing

Anthropic's Claude series — long context, dependable tool calling, and the native models behind Claude Code.

Model IDanthropic/claude-sonnet-5.5
ChatStreamingTool callingVision
Get API KeyRun your first request

Call summary

Input
$2.00$1.20/ 1M tokens
Cache write $1.50
Cache read $0.12
Output
$10.00$6.00/ 1M tokens
Context Window
1.05M
API Endpoints
2

Claude Sonnet 5.5 API endpoints

One API key — call this model through any of the 2 endpoints below.

POST/v1/chat/completionsOpenAI-compatible · Works for every model
Chat Completions reference
POST/v1/messagesAnthropic-native · Native for Claude Code
Messages API reference

Production reliability

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More Claude models on Router One

27 other Claude models on the same gateway and API key — each page lists endpoints, posted price, and context window.

claude-fable-5$8.00 in / $40.00 out per 1M1.05M contextclaude-haiku-4.5$0.30 in / $3.00 out per 1M200K contextclaude-opus-4.6$2.25 in / $11.25 out per 1M1.05M contextclaude-opus-4.6-thinking$2.25 in / $11.25 out per 1M1.05M contextclaude-opus-4.7-thinking$2.25 in / $11.25 out per 1M1.05M contextclaude-opus-4.8$2.25 in / $11.25 out per 1M1.05M contextclaude-opus-5$2.25 in / $11.25 out per 1M1.05M contextclaude-opus-5.5$2.40 in / $12.00 out per 1M1.05M contextclaude-sonnet-4.6$0.90 in / $4.50 out per 1M1.05M contextclaude-sonnet-4.6-thinking$0.90 in / $4.50 out per 1M1.05M contextclaude-sonnet-5$0.90 in / $4.50 out per 1M1.05M context
16 channel versions
claude-haiku-4.5 · AWS$1.00 in / $5.00 out per 1M200K contextclaude-opus-4.5 · AWS$5.00 in / $25.00 out per 1M200K contextclaude-opus-4.6 · AWS$5.00 in / $25.00 out per 1M1M contextclaude-opus-4.7 · AWS$5.00 in / $25.00 out per 1M1M contextclaude-opus-4.8 · AWS$5.00 in / $25.00 out per 1M1M contextclaude-opus-5 · AWS$5.00 in / $25.00 out per 1M1M contextclaude-sonnet-4.5 · AWS$3.00 in / $15.00 out per 1M200K contextclaude-sonnet-4.6 · AWS$3.00 in / $15.00 out per 1M1M contextclaude-sonnet-5 · AWS$2.00 in / $10.00 out per 1M1M contextclaude-opus-4.6 · Vertex$5.00 in / $25.00 out per 1M1M contextclaude-opus-4.7 · Vertex$5.00 in / $25.00 out per 1M1M contextclaude-opus-4.8 · Vertex$5.00 in / $25.00 out per 1M1M contextclaude-opus-5 · Vertex$5.00 in / $25.00 out per 1M1M contextclaude-sonnet-4.5 · Vertex$3.00 in / $15.00 out per 1M200K contextclaude-sonnet-4.6 · Vertex$3.00 in / $15.00 out per 1M1M contextclaude-sonnet-5 · Vertex$2.00 in / $10.00 out per 1M1M context

Claude Sonnet 5.5 at a glance

Claude Sonnet 5.5 (model ID anthropic/claude-sonnet-5.5) is a Claude-series text model on Router One. Posted rate: $1.20 in / $6.00 out per 1M tokens (was $2.00 in / $10.00 out). No Router One subscription plan includes Claude Sonnet 5.5 today; every call bills the wallet at its posted rate. Context window: 1.05M tokens. Accepts text, image; returns text. Endpoints: POST /v1/chat/completions (OpenAI-compatible), POST /v1/messages (Anthropic-native, the Claude Code path).

Claude Sonnet 5.5 FAQ

How much does Claude Sonnet 5.5 cost on Router One?

Claude Sonnet 5.5 is billed per token on Router One: $1.20 in / $6.00 out per 1M tokens, pay as you go.

Is Claude Sonnet 5.5 included in Router One subscriptions?

No Router One subscription plan includes Claude Sonnet 5.5 today; every call bills the wallet at its posted rate.

Which endpoints serve Claude Sonnet 5.5?

Claude Sonnet 5.5 is served on 2 endpoints — POST /v1/chat/completions (OpenAI-compatible), POST /v1/messages (Anthropic-native, the Claude Code path). The same Router One API key works on each.

What is Claude Sonnet 5.5's context window?

Claude Sonnet 5.5 accepts up to 1.05M tokens of context per request on Router One.

Start using Claude Sonnet 5.5

Create an API key and call Claude Sonnet 5.5 at $1.20 in / $6.00 out per 1M tokens on Router One — pay as you go, with per-request cost and latency visibility.

Get API KeyPlans & pay-as-you-go pricingCompare models side by sideQuickstart guideClaude API access