Model comparison
Chatgpt 4o Latest 20250326 vs Kimi K2.5
Kimi K2.5 is the stronger model overall, scoring 48.1 to 43.8 on the Noometry Index.
Last verified . 20 shared benchmarks.
Summary
- They share 20 benchmarks with published results for both. Chatgpt 4o Latest 20250326 scores higher in 1 category and Kimi K2.5 in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Kimi K2.5 leads 53.6 to 39.2.
- Kimi K2.5 has downloadable open weights; the other is API-only.
Side by side
| Chatgpt 4o Latest 20250326 | Kimi K2.5 | |
|---|---|---|
| Provider | OpenAI | Moonshot AI |
| Noometry Index | 43.8 | 48.1 |
| Released | — | 2026-01-27 |
| Weights | Proprietary | Open |
| Context window | — | 262K |
| Max output | — | 262K |
| Input $ / M tokens | — | $0.45 |
| Output $ / M tokens | — | $2.25 |
| Results tracked | 21 | 51 |
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Category by category
Coding Kimi K2.5 leads
Chatgpt 4o Latest 20250326: 41.6 (#122), Kimi K2.5: 48.8 (#53)
| Benchmark | Chatgpt 4o Latest 20250326 | Kimi K2.5 |
|---|---|---|
| LMArena Coding | 1413 | 1474 |
| SWE-bench Verified | — | 73.8% |
| SWE-bench Verified (bash only) | — | 70.8% |
| LMArena WebDev | — | 1437 |
| SWE-bench Multilingual | — | 67.3% |
| SciCode | — | 49% |
| WeirdML | — | 45.6% |
| ALE-Bench | — | 821.65 |
Agentic & Tool Use Not comparable
Chatgpt 4o Latest 20250326: —, Kimi K2.5: 34.2 (#48)
| Benchmark | Chatgpt 4o Latest 20250326 | Kimi K2.5 |
|---|---|---|
| Terminal-Bench | — | 43.2% |
| OSWorld | — | 63.3% |
| Vending-Bench 2 | — | 1,198 |
Reasoning Chatgpt 4o Latest 20250326 leads
Chatgpt 4o Latest 20250326: 33.8 (#71), Kimi K2.5: 31.2 (#80)
| Benchmark | Chatgpt 4o Latest 20250326 | Kimi K2.5 |
|---|---|---|
| Kagi LLM Benchmark | 75% | 78.5% |
| LMArena Hard Prompts | 1424 | 1453 |
| ARC-AGI-2 | — | 11.8% |
| SimpleBench | — | 46.8% |
| NYT Connections (extended) | — | 69.9% |
| ARC-AGI-1 | — | 65.3% |
| CritPt | — | 3.1% |
| Chess Puzzles | — | 12% |
| EnigmaEval | — | 3.4% |
| Thematic Generalization | — | 69.4% |
| Epoch Capabilities Index | — | 148.03 |
Math Kimi K2.5 leads
Chatgpt 4o Latest 20250326: 38.6 (#134), Kimi K2.5: 51.8 (#53)
| Benchmark | Chatgpt 4o Latest 20250326 | Kimi K2.5 |
|---|---|---|
| LMArena Math | 1407 | 1470 |
| MathArena Final-Answer Competitions | — | 62.3% |
| OTIS Mock AIME 2024-2025 | — | 92.2% |
| FrontierMath (Feb 2025 set) | — | 27.9% |
| FrontierMath Tier 4 (v1) | — | 4.2% |
Knowledge Kimi K2.5 leads
Chatgpt 4o Latest 20250326: 39.2 (#137), Kimi K2.5: 53.6 (#56)
| Benchmark | Chatgpt 4o Latest 20250326 | Kimi K2.5 |
|---|---|---|
| LMArena Expert | 1401 | 1466 |
| GPQA Diamond | — | 87.6% |
| Humanity's Last Exam | — | 24.4% |
| SimpleQA Verified | — | 34.3% |
| Confabulations | 16.6% | — |
| Vectara Hallucination Rate | — | 14.2% |
Multimodal Kimi K2.5 leads
Chatgpt 4o Latest 20250326: 39.6 (#58), Kimi K2.5: 41.1 (#39)
| Benchmark | Chatgpt 4o Latest 20250326 | Kimi K2.5 |
|---|---|---|
| LMArena Vision | 1243 | 1269 |
| LMArena Document | — | 1430 |
Multilingual Too close to call
Chatgpt 4o Latest 20250326: 52.9 (#76), Kimi K2.5: 53.9 (#53)
| Benchmark | Chatgpt 4o Latest 20250326 | Kimi K2.5 |
|---|---|---|
| LMArena Non-English | 1419 | 1433 |
| LMArena Chinese | 1457 | 1495 |
| LMArena French | 1446 | 1454 |
| LMArena German | 1423 | 1441 |
| LMArena Japanese | 1405 | 1421 |
| LMArena Korean | 1396 | 1410 |
| LMArena Russian | 1429 | 1435 |
| LMArena Spanish | 1434 | 1450 |
Instruction Following Kimi K2.5 leads
Chatgpt 4o Latest 20250326: 74.0 (#107), Kimi K2.5: 75.3 (#64)
| Benchmark | Chatgpt 4o Latest 20250326 | Kimi K2.5 |
|---|---|---|
| LMArena Instruction Following | 1403 | 1431 |
Long Context Kimi K2.5 leads
Chatgpt 4o Latest 20250326: 43.1 (#107), Kimi K2.5: 52.1 (#7)
| Benchmark | Chatgpt 4o Latest 20250326 | Kimi K2.5 |
|---|---|---|
| LMArena Longer Query | 1413 | 1445 |
| Fiction.LiveBench | — | 86.1% |
| CL-bench | — | 19.3% |
| CL-bench Life | — | 13.2% |
Writing & Preference Kimi K2.5 leads
Chatgpt 4o Latest 20250326: 62.6 (#72), Kimi K2.5: 65.1 (#53)
| Benchmark | Chatgpt 4o Latest 20250326 | Kimi K2.5 |
|---|---|---|
| LMArena Text | 1429 | 1445 |
| LMArena Creative Writing | 1405 | 1423 |
| EQ-Bench Creative Writing | 1501 | 1579 |
| LMArena Multi-Turn | 1454 | 1444 |
Frequently asked questions
Is Chatgpt 4o Latest 20250326 better than Kimi K2.5?
Kimi K2.5 is the stronger model overall, scoring 48.1 to 43.8 on the Noometry Index.
Is Chatgpt 4o Latest 20250326 or Kimi K2.5 better for coding?
Kimi K2.5 scores higher on coding benchmarks: 48.8 versus 41.6 in the Noometry coding category.
How many benchmarks do Chatgpt 4o Latest 20250326 and Kimi K2.5 share?
20 benchmarks have published results for both models. Chatgpt 4o Latest 20250326 has 21 scored results on Noometry and Kimi K2.5 has 51.