Model comparison
Claude Opus 4.5 vs Codestral
Claude Opus 4.5 is the stronger model overall, scoring 50.5 to 30.6 on the Noometry Index. Codestral costs 22× less per token, which makes it the better buy when Claude Opus 4.5's lead doesn't matter for your workload.
Last verified . 2 shared benchmarks.
Mistral AISummary
- They share 2 benchmarks with published results for both. Claude Opus 4.5 scores higher in 2 categories and Codestral in 0 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in coding, where Claude Opus 4.5 leads 54.8 to 27.3.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 80.2% for Claude Opus 4.5 and 32.5% for Codestral.
- Codestral is cheaper at $0.30 / $0.90 per million input/output tokens, against $5 / $25 for Claude Opus 4.5.
- Codestral accepts more context: 256K tokens versus 200K.
Side by side
| Claude Opus 4.5 | Codestral | |
|---|---|---|
| Provider | Anthropic | Mistral AI |
| Noometry Index | 50.5 | 30.6 |
| Released | 2025-11-01 | 2024-05-29 |
| Weights | Proprietary | Proprietary |
| Context window | 200K | 256K |
| Max output | 64K | 8K |
| Input $ / M tokens | $5 | $0.30 |
| Output $ / M tokens | $25 | $0.90 |
| Results tracked | 69 | 7 |
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Category by category
Coding Claude Opus 4.5 leads
Claude Opus 4.5: 54.8 (#27), Codestral: 27.3 (#321)
| Benchmark | Claude Opus 4.5 | Codestral |
|---|---|---|
| ALE-Bench | 1,025 | 137.78 |
| SWE-bench Verified | 76.7% | — |
| SWE-bench Verified (bash only) | 76.8% | — |
| Aider Polyglot | — | 11.1% |
| LMArena WebDev | 1494 | — |
| SWE-bench Multilingual | 70.7% | — |
| GSO | 26.5% | — |
| WeirdML | 63.7% | — |
| BigCodeBench Instruct | — | 41.8% |
| LMArena Coding | 1504 | — |
| BigCodeBench Complete | — | 52.5% |
| AlgoTune | 1.77 | — |
| HumanEval+ | — | 73.8% |
| MBPP+ | — | 61.9% |
Agentic & Tool Use Not comparable
Claude Opus 4.5: 47.3 (#12), Codestral: —
| Benchmark | Claude Opus 4.5 | Codestral |
|---|---|---|
| Terminal-Bench | 63.1% | — |
| Berkeley Function Calling Leaderboard | 77.5% | — |
| GDPval | 45.5% | — |
| Remote Labor Index | 3.8% | — |
| τ²-bench Airline | 84% | — |
| τ²-bench Banking | 24.7% | — |
| τ²-bench Retail | 79.6% | — |
| τ²-bench Telecom | 92.3% | — |
| Cybench | 82% | — |
| DeepResearch Bench | 54.8% | — |
| OSWorld | 66.3% | — |
| BALROG | 43.5% | — |
| LMArena Search | 1180 | — |
| METR Time Horizons | 75% | — |
| Vending-Bench 2 | 4,967 | — |
Reasoning Claude Opus 4.5 leads
Claude Opus 4.5: 42.6 (#51), Codestral: 19.8 (#251)
| Benchmark | Claude Opus 4.5 | Codestral |
|---|---|---|
| Kagi LLM Benchmark | 80.2% | 32.5% |
| ARC-AGI-2 | 37.6% | — |
| SimpleBench | 62% | — |
| NYT Connections (extended) | 52.5% | — |
| ARC-AGI-1 | 80% | — |
| Chess Puzzles | 12% | — |
| EnigmaEval | 11.9% | — |
| EBR-Bench | 14.3% | — |
| LMArena Hard Prompts | 1476 | — |
| Mystery Game Puzzles | 22% | — |
| DTBench | 89.9% | — |
| LMCA | 44.5% | — |
| Epoch Capabilities Index | 150.09 | — |
| ForecastBench | 60.7 | — |
Math Not comparable
Claude Opus 4.5: 38.6 (#132), Codestral: —
| Benchmark | Claude Opus 4.5 | Codestral |
|---|---|---|
| FrontierMath (Tiers 1-3) | 34.4% | — |
| FrontierMath Tier 4 | 4.9% | — |
| OTIS Mock AIME 2024-2025 | 86.1% | — |
| ProofBench | 36% | — |
| LMArena Math | 1463 | — |
| FrontierMath (Feb 2025 set) | 20.7% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Not comparable
Claude Opus 4.5: 56.5 (#44), Codestral: —
| Benchmark | Claude Opus 4.5 | Codestral |
|---|---|---|
| GPQA Diamond | 86% | — |
| Humanity's Last Exam | 25.2% | — |
| SimpleQA Verified | 45.7% | — |
| Vectara Hallucination Rate | 10.9% | — |
| LMArena Expert | 1487 | — |
Multimodal Not comparable
Claude Opus 4.5: 31.4 (#107), Codestral: —
| Benchmark | Claude Opus 4.5 | Codestral |
|---|---|---|
| GeoBench | 75% | — |
| VPCT | 40% | — |
| Furniture Assembly | 28.3% | — |
| LMArena Document | 1462 | — |
Multilingual Not comparable
Claude Opus 4.5: 54.3 (#47), Codestral: —
| Benchmark | Claude Opus 4.5 | Codestral |
|---|---|---|
| LMArena Non-English | 1438 | — |
| LMArena Chinese | 1470 | — |
| LMArena French | 1471 | — |
| LMArena German | 1449 | — |
| LMArena Japanese | 1416 | — |
| LMArena Korean | 1424 | — |
| LMArena Russian | 1447 | — |
| LMArena Spanish | 1458 | — |
Instruction Following Not comparable
Claude Opus 4.5: 77.5 (#19), Codestral: —
| Benchmark | Claude Opus 4.5 | Codestral |
|---|---|---|
| LMArena Instruction Following | 1478 | — |
Long Context Not comparable
Claude Opus 4.5: 46.5 (#22), Codestral: —
| Benchmark | Claude Opus 4.5 | Codestral |
|---|---|---|
| CL-bench | 21.1% | — |
| LMArena Longer Query | 1480 | — |
Writing & Preference Not comparable
Claude Opus 4.5: 68.1 (#28), Codestral: —
| Benchmark | Claude Opus 4.5 | Codestral |
|---|---|---|
| LMArena Text | 1451 | — |
| LMArena Creative Writing | 1445 | — |
| EQ-Bench Creative Writing | 1687 | — |
| LMArena Multi-Turn | 1466 | — |
Frequently asked questions
Is Claude Opus 4.5 better than Codestral?
Claude Opus 4.5 is the stronger model overall, scoring 50.5 to 30.6 on the Noometry Index. Codestral costs 22× less per token, which makes it the better buy when Claude Opus 4.5's lead doesn't matter for your workload.
Which is cheaper, Claude Opus 4.5 or Codestral?
Codestral is cheaper. It lists at $0.30 per million input tokens and $0.90 per million output tokens; Claude Opus 4.5 lists at $5 and $25.
Is Claude Opus 4.5 or Codestral better for coding?
Claude Opus 4.5 scores higher on coding benchmarks: 54.8 versus 27.3 in the Noometry coding category.
Which has the bigger context window?
Codestral does, with 256K tokens against 200K.
How many benchmarks do Claude Opus 4.5 and Codestral share?
2 benchmarks have published results for both models. Claude Opus 4.5 has 69 scored results on Noometry and Codestral has 7.