Claude Opus 5.5
by Anthropic
Today's price · per 1M tokens
Input
$4.00
per 1M tokens
Output
$20.00
per 1M tokens
Blended
$8.00
blended $/1M — 3:1 weighted input:output
Cached input
$0.200
5% of input — prompt caching
Price receipt
We read Anthropic's own pricing page on and found Claude Opus 5.5 listed with a price on the same row — that read is where the number above comes from. We keep the page text we read; its content hash is d3526bdbae.
Overview
Anthropic's newest Opus flagship and the first of the Claude 5.5 family, launched 2026-09-22. Anthropic says it performs at the level of Claude Fable 5.1 on most work and costs 40% less to run than Opus 5. $4/$20 per 1M tokens with cache reads at $0.20 (5% of input, not the usual 10%); Batch API halves it to $2/$10. 1M-token context, 128K max output.
Capabilities
struck through = not supportedBenchmark performance
accuracy % · higher is better- AA Intelligence Index: 57.6 (Artificial Analysis composite across reasoning, knowledge and coding evals)
- AA-Omniscience Index: 46.4 (−100–100)
- Ranks #25 of 100 benchmarked models by average score
- Ranks #1 of 195 comparably-measured models by percentile score, across 4 independent measurements
- Ranks #160 of 195 comparably-tested models by normalized performance per dollar
- Strongest at Humanity's Last Exam — 61.4%, #2 of 81
Source: Vellum LLM Leaderboard · updated · See full rankings →
Specifications
- Provider
- Anthropic
- Context window
- 1M tokens
- Modality
- text, image
- Parameters
- Proprietary
- Open source
- No — proprietary
- Released
- Status
- Current
- Last updated
- Tags
Availability verified: — listed on Anthropic's own page