Claude Sonnet 5.5

Available

anthropic/claude-sonnet-5.5

Fast, capable model for everyday coding, agents and production workloads.

Chat
1M context
128K max output
Vision
Tools

Try in Playground Compare

Pricing

Input: $2 / 1M tokens
Output: $10 / 1M tokens
Cached input: $0.10 / 1M tokens

What it costs

A typical request: 2,000 tokens in, 500 out$0.009

1,000 of those requests$9.00

Performance on SparrowCodes

Measured from real requests over the last 7 days.

No traffic yet. Speed, latency and success rate appear here once this model has served requests on SparrowCodes; we don't show estimates.

Official benchmarks

Scores published by the model's maker, under their test conditions.

Terminal-Bench 4.070.6%
FrontierCode 1.1 (Main)52.1%
CursorBench 4.055.5%
GDPval-AA v2.11844 Elo
AA-Briefcase v1.11811 Elo
Humanity's Last Exam · with tools64.5%
OSWorld 2.1 · partial80.1%
Chartography · no tools61.6%

Source: Anthropic: Claude Sonnet 5.5 announcement (2026-09-28)

Source: Anthropic: Claude Haiku 5.5 announcement (Sonnet 5.5 reference column) (2026-10-07)

Specifications

Type: Chat
Served by: Anthropic
Context window: 1,000,000 tokens
Maximum output: 128,000 tokens
Input types: Text, Image
Tool calling: Supported

Use it

curl https://api.sparrowcodes.com/v1/chat/completions \
  -H "Authorization: Bearer $SPARROW_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "anthropic/claude-sonnet-5.5",
    "messages": [{"role": "user", "content": "Explain rate limiting in one paragraph."}]
  }'

Set "model" to anthropic/claude-sonnet-5.5. The response includes its exact cost.

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