Model comparison
Grok Build 0.1 vs Kimi K2.5
Kimi K2.5 is the stronger model overall, scoring 48.1 to 36.4 on the Noometry Index.
Last verified . 2 shared benchmarks.
Summary
- They share 2 benchmarks with published results for both. Grok Build 0.1 scores higher in 1 category and Kimi K2.5 in 2 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in agentic & tool use, where Kimi K2.5 leads 34.2 to 22.7.
- The biggest single-benchmark swing is CritPt: 9.1% for Grok Build 0.1 and 3.1% for Kimi K2.5.
- Kimi K2.5 is cheaper at $0.45 / $2.25 per million input/output tokens, against $1 / $2 for Grok Build 0.1.
- Kimi K2.5 accepts more context: 262K tokens versus 256K.
- Kimi K2.5 has downloadable open weights; the other is API-only.
Side by side
| Grok Build 0.1 | Kimi K2.5 | |
|---|---|---|
| Provider | xAI | Moonshot AI |
| Noometry Index | 36.4 | 48.1 |
| Released | 2026-04-16 | 2026-01-27 |
| Weights | Proprietary | Open |
| Context window | 256K | 262K |
| Max output | 256K | 262K |
| Input $ / M tokens | $1 | $0.45 |
| Output $ / M tokens | $2 | $2.25 |
| Results tracked | 3 | 51 |
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Category by category
Coding Kimi K2.5 leads
Grok Build 0.1: 43.1 (#91), Kimi K2.5: 48.8 (#53)
| Benchmark | Grok Build 0.1 | Kimi K2.5 |
|---|---|---|
| SciCode | 50.2% | 49% |
| SWE-bench Verified | — | 73.8% |
| SWE-bench Verified (bash only) | — | 70.8% |
| LMArena WebDev | — | 1437 |
| SWE-bench Multilingual | — | 67.3% |
| WeirdML | — | 45.6% |
| LMArena Coding | — | 1474 |
| ALE-Bench | — | 821.65 |
Agentic & Tool Use Kimi K2.5 leads
Grok Build 0.1: 22.7 (#129), Kimi K2.5: 34.2 (#48)
| Benchmark | Grok Build 0.1 | Kimi K2.5 |
|---|---|---|
| Terminal-Bench | — | 43.2% |
| OSWorld | — | 63.3% |
| GBAEval | 2.4% | — |
| Vending-Bench 2 | — | 1,198 |
Reasoning Too close to call
Grok Build 0.1: 32.2 (#77), Kimi K2.5: 31.2 (#80)
| Benchmark | Grok Build 0.1 | Kimi K2.5 |
|---|---|---|
| CritPt | 9.1% | 3.1% |
| ARC-AGI-2 | — | 11.8% |
| SimpleBench | — | 46.8% |
| Kagi LLM Benchmark | — | 78.5% |
| NYT Connections (extended) | — | 69.9% |
| ARC-AGI-1 | — | 65.3% |
| Chess Puzzles | — | 12% |
| EnigmaEval | — | 3.4% |
| Thematic Generalization | — | 69.4% |
| LMArena Hard Prompts | — | 1453 |
| Epoch Capabilities Index | — | 148.03 |
Math Not comparable
Grok Build 0.1: —, Kimi K2.5: 51.8 (#53)
| Benchmark | Grok Build 0.1 | Kimi K2.5 |
|---|---|---|
| MathArena Final-Answer Competitions | — | 62.3% |
| OTIS Mock AIME 2024-2025 | — | 92.2% |
| LMArena Math | — | 1470 |
| FrontierMath (Feb 2025 set) | — | 27.9% |
| FrontierMath Tier 4 (v1) | — | 4.2% |
Knowledge Not comparable
Grok Build 0.1: —, Kimi K2.5: 53.6 (#56)
| Benchmark | Grok Build 0.1 | Kimi K2.5 |
|---|---|---|
| GPQA Diamond | — | 87.6% |
| Humanity's Last Exam | — | 24.4% |
| SimpleQA Verified | — | 34.3% |
| Vectara Hallucination Rate | — | 14.2% |
| LMArena Expert | — | 1466 |
Multimodal Not comparable
Grok Build 0.1: —, Kimi K2.5: 41.1 (#39)
| Benchmark | Grok Build 0.1 | Kimi K2.5 |
|---|---|---|
| LMArena Vision | — | 1269 |
| LMArena Document | — | 1430 |
Multilingual Not comparable
Grok Build 0.1: —, Kimi K2.5: 53.9 (#53)
| Benchmark | Grok Build 0.1 | Kimi K2.5 |
|---|---|---|
| LMArena Non-English | — | 1433 |
| LMArena Chinese | — | 1495 |
| LMArena French | — | 1454 |
| LMArena German | — | 1441 |
| LMArena Japanese | — | 1421 |
| LMArena Korean | — | 1410 |
| LMArena Russian | — | 1435 |
| LMArena Spanish | — | 1450 |
Instruction Following Not comparable
Grok Build 0.1: —, Kimi K2.5: 75.3 (#64)
| Benchmark | Grok Build 0.1 | Kimi K2.5 |
|---|---|---|
| LMArena Instruction Following | — | 1431 |
Long Context Not comparable
Grok Build 0.1: —, Kimi K2.5: 52.1 (#7)
| Benchmark | Grok Build 0.1 | Kimi K2.5 |
|---|---|---|
| Fiction.LiveBench | — | 86.1% |
| CL-bench | — | 19.3% |
| CL-bench Life | — | 13.2% |
| LMArena Longer Query | — | 1445 |
Writing & Preference Not comparable
Grok Build 0.1: —, Kimi K2.5: 65.1 (#53)
| Benchmark | Grok Build 0.1 | Kimi K2.5 |
|---|---|---|
| LMArena Text | — | 1445 |
| LMArena Creative Writing | — | 1423 |
| EQ-Bench Creative Writing | — | 1579 |
| LMArena Multi-Turn | — | 1444 |
Frequently asked questions
Is Grok Build 0.1 better than Kimi K2.5?
Kimi K2.5 is the stronger model overall, scoring 48.1 to 36.4 on the Noometry Index.
Which is cheaper, Grok Build 0.1 or Kimi K2.5?
Kimi K2.5 is cheaper. It lists at $0.45 per million input tokens and $2.25 per million output tokens; Grok Build 0.1 lists at $1 and $2.
Is Grok Build 0.1 or Kimi K2.5 better for coding?
Kimi K2.5 scores higher on coding benchmarks: 48.8 versus 43.1 in the Noometry coding category.
Which has the bigger context window?
Kimi K2.5 does, with 262K tokens against 256K.
How many benchmarks do Grok Build 0.1 and Kimi K2.5 share?
2 benchmarks have published results for both models. Grok Build 0.1 has 3 scored results on Noometry and Kimi K2.5 has 51.