Model comparison
Claude Opus 4.8 vs o3-mini
Claude Opus 4.8 is the stronger model overall, scoring 60.7 to 36.7 on the Noometry Index. o3-mini costs 5.2× less per token, which makes it the better buy when Claude Opus 4.8's lead doesn't matter for your workload.
Last verified . 37 shared benchmarks.
Summary
- They share 37 benchmarks with published results for both. Claude Opus 4.8 scores higher in 9 categories and o3-mini in 0 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Opus 4.8 leads 78.4 to 28.1.
- The biggest single-benchmark swing is ARC-AGI-2: 72.1% for Claude Opus 4.8 and 3% for o3-mini.
- o3-mini is cheaper at $1.10 / $4.40 per million input/output tokens, against $5 / $25 for Claude Opus 4.8.
- Claude Opus 4.8 accepts more context: 1M tokens versus 200K.
Side by side
| Claude Opus 4.8 | o3-mini | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 60.7 | 36.7 |
| Released | 2026-05-28 | 2024-12-20 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | 200K |
| Max output | 128K | 100K |
| Input $ / M tokens | $5 | $1.10 |
| Output $ / M tokens | $25 | $4.40 |
| Results tracked | 65 | 51 |
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Category by category
Coding Claude Opus 4.8 leads
Claude Opus 4.8: 59.9 (#12), o3-mini: 40.8 (#132)
| Benchmark | Claude Opus 4.8 | o3-mini |
|---|---|---|
| SciCode | 53.5% | 39.8% |
| GSO | 47.1% | 1.3% |
| WeirdML | 82.9% | 43.7% |
| LMArena Coding | 1490 | 1378 |
| DeepSWE | 59% | — |
| FrontierCode | 46.5% | — |
| Aider Polyglot | — | 60.4% |
| LMArena WebDev | 1556 | — |
| LiveBench Coding | — | 82.7% |
| CadEval | — | 54% |
| ALE-Bench | 1,564 | — |
Agentic & Tool Use Claude Opus 4.8 leads
Claude Opus 4.8: 47.6 (#11), o3-mini: 29.6 (#84)
| Benchmark | Claude Opus 4.8 | o3-mini |
|---|---|---|
| APEX-Agents | 48.9% | — |
| OSWorld 2.0 | 20.6% | — |
| Remote Labor Index | 8.3% | — |
| τ²-bench Banking | 39.7% | — |
| Cybench | — | 22.5% |
| DeepResearch Bench | 50.2% | — |
| PostTrainBench | 33.8% | — |
| GBAEval | 70.9% | — |
| GDP.pdf | 24% | — |
| LMArena Search | 1204 | — |
| Vending-Bench 2 | 5,787 | — |
Reasoning Claude Opus 4.8 leads
Claude Opus 4.8: 64.7 (#16), o3-mini: 16.3 (#305)
| Benchmark | Claude Opus 4.8 | o3-mini |
|---|---|---|
| ARC-AGI-2 | 72.1% | 3% |
| SimpleBench | 64.8% | 22.8% |
| ARC-AGI-1 | 92.5% | 34.5% |
| CritPt | 20.9% | 0.3% |
| Chess Puzzles | 34% | 17% |
| LMArena Hard Prompts | 1482 | 1366 |
| Mystery Game Puzzles | 36% | 7% |
| DTBench | 94.9% | 68.8% |
| LMCA | 57.5% | 19% |
| Epoch Capabilities Index | 158.21 | 140.34 |
| ForecastBench | 59.9 | 59.6 |
| Kagi LLM Benchmark | 88.8% | — |
| NYT Connections (extended) | 91.1% | — |
| EnigmaEval | 23.5% | — |
| EBR-Bench | 28.6% | — |
| LiveBench Reasoning | — | 89.6% |
| LiveBench Data Analysis | — | 70.6% |
| Surface Evolver Bench | 87.5% | — |
| Bench to the Future 3 | 0.14 | — |
| LiveBench | — | 75.9% |
Math Claude Opus 4.8 leads
Claude Opus 4.8: 78.4 (#13), o3-mini: 28.1 (#244)
| Benchmark | Claude Opus 4.8 | o3-mini |
|---|---|---|
| FrontierMath (Tiers 1-3) | 80% | 18.6% |
| FrontierMath Tier 4 | 56.1% | 0% |
| OTIS Mock AIME 2024-2025 | 98.3% | 76.9% |
| LMArena Math | 1487 | 1396 |
| FrontierMath (Feb 2025 set) | 47.2% | 12.4% |
| FrontierMath Tier 4 (v1) | 31.3% | 4.2% |
| MathArena Final-Answer Competitions | 91.8% | — |
| ProofBench | 69% | — |
| LiveBench Math | — | 77.3% |
| MATH Level 5 | — | 96.5% |
Knowledge Claude Opus 4.8 leads
Claude Opus 4.8: 61.3 (#29), o3-mini: 38.3 (#146)
| Benchmark | Claude Opus 4.8 | o3-mini |
|---|---|---|
| GPQA Diamond | 91% | 77% |
| SimpleQA Verified | 53% | 15.3% |
| LMArena Expert | 1502 | 1364 |
| Confabulations | — | 17.9% |
Multimodal Not comparable
Claude Opus 4.8: 42.9 (#26), o3-mini: —
| Benchmark | Claude Opus 4.8 | o3-mini |
|---|---|---|
| LMArena Vision | 1294 | — |
| Blueprint-Bench 2 | 14.5% | — |
| Furniture Assembly | 42.5% | — |
| LMArena Document | 1475 | — |
Multilingual Claude Opus 4.8 leads
Claude Opus 4.8: 55.2 (#33), o3-mini: 45.7 (#164)
| Benchmark | Claude Opus 4.8 | o3-mini |
|---|---|---|
| LMArena Non-English | 1450 | 1319 |
| LMArena Chinese | 1507 | 1379 |
| LMArena French | 1481 | 1334 |
| LMArena German | 1472 | 1303 |
| LMArena Japanese | 1440 | 1286 |
| LMArena Korean | 1432 | 1314 |
| LMArena Russian | 1474 | 1304 |
| LMArena Spanish | 1466 | 1321 |
Instruction Following Claude Opus 4.8 leads
Claude Opus 4.8: 77.4 (#24), o3-mini: 75.1 (#72)
| Benchmark | Claude Opus 4.8 | o3-mini |
|---|---|---|
| LMArena Instruction Following | 1476 | 1337 |
| LiveBench Instruction Following | — | 84.4% |
Long Context Claude Opus 4.8 leads
Claude Opus 4.8: 45.4 (#35), o3-mini: 33.8 (#256)
| Benchmark | Claude Opus 4.8 | o3-mini |
|---|---|---|
| LMArena Longer Query | 1483 | 1343 |
| Fiction.LiveBench | — | 50% |
Writing & Preference Claude Opus 4.8 leads
Claude Opus 4.8: 72.0 (#16), o3-mini: 50.3 (#182)
| Benchmark | Claude Opus 4.8 | o3-mini |
|---|---|---|
| LMArena Text | 1461 | 1337 |
| LMArena Creative Writing | 1454 | 1286 |
| LMArena Multi-Turn | 1476 | 1320 |
| Short-Story Creative Writing | — | 61.7% |
| EQ-Bench Creative Writing | 1840 | — |
| EQ-Bench 4 | 1281 | — |
| LiveBench Language | — | 50.7% |
Frequently asked questions
Is Claude Opus 4.8 better than o3-mini?
Claude Opus 4.8 is the stronger model overall, scoring 60.7 to 36.7 on the Noometry Index. o3-mini costs 5.2× less per token, which makes it the better buy when Claude Opus 4.8's lead doesn't matter for your workload.
Which is cheaper, Claude Opus 4.8 or o3-mini?
o3-mini is cheaper. It lists at $1.10 per million input tokens and $4.40 per million output tokens; Claude Opus 4.8 lists at $5 and $25.
Is Claude Opus 4.8 or o3-mini better for coding?
Claude Opus 4.8 scores higher on coding benchmarks: 59.9 versus 40.8 in the Noometry coding category.
Which has the bigger context window?
Claude Opus 4.8 does, with 1M tokens against 200K.
How many benchmarks do Claude Opus 4.8 and o3-mini share?
37 benchmarks have published results for both models. Claude Opus 4.8 has 65 scored results on Noometry and o3-mini has 51.