Claude Opus 5.5

Available

anthropic/claude-opus-5.5

Anthropic's most capable Opus model for complex reasoning, coding and agents.

Chat
1M context
128K max output
Vision
Tools

Try in Playground Compare

Pricing

Input: $4 / 1M tokens
Output: $20 / 1M tokens
Cached input: $0.20 / 1M tokens

What it costs

A typical request: 2,000 tokens in, 500 out$0.018

1,000 of those requests$18.00

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 4.066.4%
FrontierCode 1.1 (Main)54.4%
CursorBench 4.057.8%
GDPval-AA v2.11846 Elo
AutomationBench40.0%
Humanity's Last Exam · with tools67.7%
Terminal-Bench-Science 0.158.7%
OSWorld 2.1 · partial81.8%
Chartography · with tools89.0%

Source: Anthropic: Claude Opus 5.5 announcement (2026-09-22)

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-opus-5.5",
    "messages": [{"role": "user", "content": "Explain rate limiting in one paragraph."}]
  }'

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

More from Anthropic

All models