Claude Opus 5

Anthropic · 2026-07-24

Basic Information

Developer: Anthropic
Release Date: 2026-07-24
Overall Capability Index (ECI): 162.9

Benchmark Scores (Epoch AI)

Each benchmark also shows the model's rank among the models evaluated.

PhD-level science questions (GPQA Diamond) · #12 of 30

93.9%

Advanced mathematics (FrontierMath) · #11 of 30

85.6%

Reasoning through unfamiliar puzzles (ARC-AGI-2) · #4 of 30

90.4%

Factual question accuracy (SimpleQA Verified) · #16 of 30

59.9%

Computer interface tasks (OSWorld 2.0) · #1 of 9

31.4%

Bars show accuracy (%) and start at 0%.

User Vote Rankings (LMArena)

Rankings based on people's votes comparing responses from two models. Models do not appear on leaderboards where they have too few votes.

Overall#4 of 413 · 1504
English#6 of 413 · 1506
Web development#1 of 50 · 1815
Document understanding#1 of 44 · 1516
Creative writing#2 of 411 · 1516
Chinese#2 of 389 · 1571
Overall agent performance#2 of 50 · 0.138
Math#3 of 396 · 1521
Korean#3 of 278 · 1498
Japanese#4 of 274 · 1506
Agent task success#4 of 50 · 0.141
German#6 of 307 · 1506
Spanish#10 of 295 · 1484
Coding#12 of 408 · 1538
Image understanding (vision)#14 of 50 · 1289
French#17 of 290 · 1506

Where to Use It

Models from Anthropic are primarily available through Claude. Available models and usage limits vary by plan, so check the pricing and free access page.

View Claude pricing and free access →

Hands-on Test Reports

Responding to feedback that the first round was too easy, we tested bugs across multiple files, a feature defined by a specification, and a concurrency bug in a small online store codebase. We publish all 18 run records and task files.

Claude Code vs Codex, round 2: 3 practical tasks across multiple files, each run 3 times

Scores and rankings are reproduced directly from public sources and were not measured by this site. Model names vary slightly across sources and are matched automatically, so different versions may occasionally be mixed together.

Source: Epoch AI (CC BY 4.0) · Checked 2026-10-04 · LMArena (CC BY 4.0) · Checked 2026-10-04