Anthropic, language model

Claude Opus 5.5

Released Sep 22, 2026. Scored on 5 boards, holding the record on 2.

58Artificial Analysis Intelligence IndexRank 1 of 40, holds the record

Released: Sep 22, 2026
Price, in / out: $4.00 / $20.00; per 1M tokens, list price
Blended price: $8.00; 3 input tokens per output token
Output speed: 96; Tok / s, Oct 20, 2026
Context: 1M; tokens
Open weights: No

Scores

The latest published score on each board, ranked against every model we track. Each score links to its source.

Claude Opus 5.5 scores by board
Board	Score	Rank	Record	Date	Source	Readings
Artificial Analysis Intelligence IndexOverall	58Max, Default Fallback	1 of 40	Record	Oct 20, 2026	artificialanalysis.ai	2
LMArena textOverall	1507aggregator snapshot	2 of 3	1525Gemini 4 Argon	Oct 8, 2026	essentras.com	1
Humanity's Last ExamReasoning and knowledge	67.7%with tools, lab-reported	1 of 4	Record	Sep 22, 2026	anthropic.com	1
ARC-AGI-2Reasoning and knowledge	93.3%High setting	3 of 3	95.0%GPT-6 Astra	Oct 19, 2026	benchlm.ai	1
Output speedSpeed	96Max, Default Fallback	11 of 26	239Claude Haiku 5.5	Oct 20, 2026	artificialanalysis.ai	2

History

Every reading we have stored for Claude Opus 5.5, on each board with more than one.

Artificial Analysis Intelligence Index

Oct 20, 202658
Oct 20, 202658

Output speed

Oct 20, 202695
Oct 20, 202696

Compare with

The closest models on the boards they share with Claude Opus 5.5.

Compare with any model

Related news

Stories tagged with Claude Opus 5.5 or naming it in the headline, newest first.

Oct 20, 2026

r/LocalLLaMACommunity

Six-way benchmark compares Qwen3.8-Flash-Next locally against Claude Opus 5.5 on a Rust feature

A community test of 12 PRs on a LlamaStash feature found Opus 5.5 averaged 82% against 68% for Claude Code with Flash-Next and 66% for Pi with Flash-Next. Flash-Next ran locally at about 4.16 bpw, so the author paid only electricity, and results are a single developer's unverified experiment.