Model comparison
Claude Instant vs Grok 4 Fast
Grok 4 Fast has enough public results to be ranked (#164); Claude Instant does not yet, so treat this comparison as directional.
Last verified . 2 shared benchmarks.
Summary
- They share 2 benchmarks with published results for both. Claude Instant scores higher in 0 categories and Grok 4 Fast in 1 category; one gap is clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4 Fast leads 22.5 to 18.8.
- The biggest single-benchmark swing is DTBench: 45.8% for Claude Instant and 82.7% for Grok 4 Fast.
Side by side
| Claude Instant | Grok 4 Fast | |
|---|---|---|
| Provider | Anthropic | xAI |
| Noometry Index | 28.8 | 39.0 |
| Released | 2023-08-09 | 2025-09-19 |
| Weights | Proprietary | Proprietary |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 7 | 30 |
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Category by category
Coding Not comparable
Claude Instant: —, Grok 4 Fast: 32.3 (#264)
| Benchmark | Claude Instant | Grok 4 Fast |
|---|---|---|
| LMArena WebDev | — | 1160 |
| WeirdML | — | 42.9% |
| LMArena Coding | — | 1429 |
| HumanEval+ | 50.6% | — |
Agentic & Tool Use Not comparable
Claude Instant: —, Grok 4 Fast: 29.3 (#80)
| Benchmark | Claude Instant | Grok 4 Fast |
|---|---|---|
| τ²-bench Banking | — | 15.7% |
| Cybench | — | 30% |
| LMArena Search | — | 1171 |
Reasoning Grok 4 Fast leads
Claude Instant: 18.8, Grok 4 Fast: 22.5 (#179)
| Benchmark | Claude Instant | Grok 4 Fast |
|---|---|---|
| DTBench | 45.8% | 82.7% |
| Epoch Capabilities Index | 120.2 | 144.21 |
| ARC-AGI-2 | — | 5.3% |
| Kagi LLM Benchmark | — | 66.1% |
| ARC-AGI-1 | — | 48.5% |
| LMArena Hard Prompts | — | 1413 |
| ForecastBench | — | 60.5 |
Math Not comparable
Claude Instant: —, Grok 4 Fast: 36.1 (#126)
| Benchmark | Claude Instant | Grok 4 Fast |
|---|---|---|
| LMArena Math | — | 1419 |
| GSM8K | 86.7% | — |
Knowledge Not comparable
Claude Instant: —, Grok 4 Fast: 31.5 (#211)
| Benchmark | Claude Instant | Grok 4 Fast |
|---|---|---|
| Vectara Hallucination Rate | — | 19.7% |
| LMArena Expert | — | 1411 |
| ARC (AI2) Challenge | 86.3% | — |
| MMLU | 73.4% | — |
| TriviaQA | 78.9% | — |
Multilingual Not comparable
Claude Instant: —, Grok 4 Fast: 51.5 (#106)
| Benchmark | Claude Instant | Grok 4 Fast |
|---|---|---|
| LMArena Non-English | — | 1397 |
| LMArena Chinese | — | 1458 |
| LMArena French | — | 1433 |
| LMArena German | — | 1383 |
| LMArena Japanese | — | 1358 |
| LMArena Korean | — | 1359 |
| LMArena Russian | — | 1387 |
| LMArena Spanish | — | 1414 |
Instruction Following Not comparable
Claude Instant: —, Grok 4 Fast: 73.4 (#116)
| Benchmark | Claude Instant | Grok 4 Fast |
|---|---|---|
| LMArena Instruction Following | — | 1388 |
Long Context Not comparable
Claude Instant: —, Grok 4 Fast: 63.2 (#3)
| Benchmark | Claude Instant | Grok 4 Fast |
|---|---|---|
| Fiction.LiveBench | — | 94.4% |
| LMArena Longer Query | — | 1415 |
Writing & Preference Not comparable
Claude Instant: —, Grok 4 Fast: 60.2 (#96)
| Benchmark | Claude Instant | Grok 4 Fast |
|---|---|---|
| LMArena Text | — | 1407 |
| LMArena Creative Writing | — | 1388 |
| LMArena Multi-Turn | — | 1414 |
Frequently asked questions
Is Claude Instant better than Grok 4 Fast?
Grok 4 Fast has enough public results to be ranked (#164); Claude Instant does not yet, so treat this comparison as directional.
How many benchmarks do Claude Instant and Grok 4 Fast share?
2 benchmarks have published results for both models. Claude Instant has 7 scored results on Noometry and Grok 4 Fast has 30.