C
Claude Opus 5.5
The most capable closed model you can actually use — first on both long-horizon coding and professional reasoning
Intelligence v5
59.1
Leaderboard rank
#2
Input / output
$4.00/$20.00
Blended 3:1
$8.00
Output speed
94 tok/s
Value
7 pts/$
Capability profile Normalised to the field maximum
Specifications
Vendor
Anthropic
Released
2026-10
Weights
Closed, API only
Context
1,000,000 tokens
Max output
128,000 tokens
Parameters
Undisclosed
Input price
$4.00 / 1M
Output price
$20.00 / 1M
Cache hit
$0.20 / 1M
Output speed
94 tok/s
Intelligence
59.1（v5）
Benchmark scores
How it is measured →Ranked 2 · bars are scaled to the field maximum for that benchmark.
| Benchmarks | Score | Vs. best in field | Gap |
|---|---|---|---|
| AA Intelligence Index v5 Intelligence index | 59.1 | 98% | −0.9 pts |
| AA Intelligence Index v4.3.2 Intelligence index (legacy) | 57.6 | 100% | |
| GPQA Diamond Graduate-level science reasoning | 93.9 | 97% | −2.5 pts |
| Terminal-Bench 4.0 Terminal-agent tasks | 59.6 | 89% | −7.6 pts |
| LiveBench Design Document generation (DOCX/PPT/PDF) | 86.9 | 100% | |
| Vals Index Vals composite index | 72.4 | 99% | −0.7 pts |
Assessment
Ranks first on AA Intelligence Index v5 among all publicly callable models. Fourth on Terminal-Bench 4.0 at 59.6%, behind Kimi K3.1 Pro, Gemini 4 Carbon and Sonnet 5.5, and its AA-Omniscience hallucination penalty of 46 leads Sonnet 5.5 by fourteen points. 20% cheaper than Opus 5 ($5/$25 → $4/$20).
At the same price
The four models closest on blended price, side by side.
| Model | v5 | Blended | tok/s | Score gap |
|---|---|---|---|---|
| Gemini 4 CarbonGoogle | 60.0 | $8.00 | 88 | +0.9 |
| Muse WonderMeta | 44.0 | $8.00 | 143 | -15.1 |
| Claude Sonnet 5.5Anthropic | 54.5 | $4.00 | 135 | -4.6 |
| GPT-6.1 SolOpenAI | 54.6 | $4.00 | 77 | -4.5 |
Compare side by side
Line it up against other models on price, speed and every benchmark.
The comparison tool lines up to 4 models side by side with switchable normalisation — built for purchasing decisions.
Open the comparison tool → Back to leaderboard