Model comparison
Grok 4.1 Fast vs Qwen3.5 397B
Head-to-head evidence from 13 shared benchmark results across 6 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Grok 4.1 Fast #107 (Supported); Qwen3.5 397B #71 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Grok 4.1 Fast and Qwen3.5 397B share 13 comparable benchmark results. 0 of 8 categories are comparable. 0 results are unique to Grok 4.1 Fast; 42 to Qwen3.5 397B.
Updated July 20, 2026- Shared results
- 13
- Grok 4.1 Fast only
- 0
- Qwen3.5 397B only
- 42
- Comparable categories
- 0 / 8
Benchmark data for Grok 4.1 Fast and Qwen3.5 397B is coming soon on BenchLM.
Confidence note. This is a partial-evidence comparison with 13 shared benchmark results across 6 evidence categories; 0 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
BenchLM has partial data for these models, but not enough overlapping benchmark coverage to produce a fair score-level comparison yet.
Qwen3.5 397B is priced at $0.60 input / $3.60 output per 1M tokens, versus $0.20 input / $0.50 output per 1M tokens for Grok 4.1 Fast. Grok 4.1 Fast has the larger context window at 1M, compared with 128K for Qwen3.5 397B.
Category breakdown
Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.
| Category | Grok 4.1 Fast | Δ | Qwen3.5 397B |
|---|---|---|---|
| Agentic | Grok 4.1 FastNot measured | MarginNo overlap | Qwen3.5 397B56.5 |
| Coding | Grok 4.1 FastNot measured | MarginNo overlap | Qwen3.5 397B66.5 |
| Reasoning | Grok 4.1 FastNot measured | MarginNo overlap | Qwen3.5 397B63.2 |
| Knowledge | Grok 4.1 FastNot measured | MarginNo overlap | Qwen3.5 397B56.6 |
| Math | Grok 4.1 FastNot measured | MarginNo overlap | Qwen3.5 397B90.6 |
| Multilingual | Grok 4.1 FastNot measured | MarginNo overlap | Qwen3.5 397B84.7 |
| Multimodal | Grok 4.1 FastNot measured | MarginNo overlap | Qwen3.5 397B79.6 |
| Inst. Following | Grok 4.1 FastNot measured | MarginNo overlap | Qwen3.5 397B92.6 |
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Grok 4.1 Fast | Qwen3.5 397B | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Grok 4.1 Fast$0.2 input / $0.5 output | Qwen3.5 397B$0.6 input / $3.6 output | Grok 4.1 Fast has the lower combined listed price. |
| Generation speedtokens per second | Grok 4.1 Fast138 tok/s | Qwen3.5 397B96 tok/s | Grok 4.1 Fast has the higher measured throughput. |
| First-answer latencyseconds to first token | Grok 4.1 Fast0.54 s | Qwen3.5 397B2.44 s | Grok 4.1 Fast reaches the first token sooner. |
| Context windowmaximum listed tokens | Grok 4.1 Fast1M | Qwen3.5 397B128K | Grok 4.1 Fast lists the larger context window. |
Benchmark Deep Dive
Agentic18 benchmarks
| Benchmark | Grok 4.1 Fast | Qwen3.5 397B | Result |
|---|---|---|---|
| τ²-bench resultsSource | 63.7% | 95.6% | Qwen3.5 397B leads |
| Gert LabsSource | 47.32% | 46.76% | Grok 4.1 Fast leads |
| Terminal-Bench 2.0Source | — | 52.5% | Not comparable |
| BrowseCompSource | — | 62% | Not comparable |
| Claw-EvalSource | — | 56.8% | Not comparable |
| QwenClawBenchSource | — | 51.8% | Not comparable |
| τ³-bench resultsSource | — | 68.4% | Not comparable |
| VITA-BenchSource | — | 43.7% | Not comparable |
| DeepPlanningSource | — | 37.6% | Not comparable |
| ToolathlonSource | — | 36.3% | Not comparable |
| MCP AtlasSource | — | 46.1% | Not comparable |
| MCP-TasksSource | — | 74.2% | Not comparable |
| WideResearchSource | — | 74.0% | Not comparable |
| ResearchClawBenchSource | — | 14.2% | Not comparable |
| AA Agentic IndexSource | — | 19.9% | Not comparable |
| APEX-Agents-AASource | — | 15.3% | Not comparable |
| GDPval-AASource | — | 23.1% | Not comparable |
| GDPval-AASource | — | 962 | Not comparable |
Coding5 benchmarks
Reasoning4 benchmarks
Knowledge12 benchmarks
| Benchmark | Grok 4.1 Fast | Qwen3.5 397B | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 16.9% | 33.7% | Qwen3.5 397B leads |
| AA-GPQA DiamondSource | 63.7% | 89.3% | Qwen3.5 397B leads |
| AA-HLESource | 5.0% | 27.3% | Qwen3.5 397B leads |
| AA-Omniscience IndexSource | -50.9% | -29.8% | Qwen3.5 397B leads |
| AA-Omniscience AccuracySource | 17.0% | 31.4% | Qwen3.5 397B leads |
| AA-Omniscience Hallucination RateSource | 81.8% | 89.1% | Grok 4.1 Fast leads |
| GPQASource | — | 88.4% | Not comparable |
| SuperGPQASource | — | 70.4% | Not comparable |
| MMLU-ProSource | — | 87.8% | Not comparable |
| MMLU-ReduxSource | — | 94.9% | Not comparable |
| C-EvalSource | — | 93% | Not comparable |
| HLESource | — | 28.7% | Not comparable |
Math5 benchmarks
Multilingual2 benchmarks
Multimodal7 benchmarks
Frequently Asked Questions (3)
Can I compare Grok 4.1 Fast and Qwen3.5 397B on BenchLM yet?
Not fully yet. BenchLM is tracking both models, but the sourced benchmark breakdown for this comparison is still coming soon.
Why does this comparison show “coming soon”?
BenchLM only shows category winners and benchmark-level calls when we have sourced results that can be compared fairly. For these models, the public benchmark coverage is not complete enough yet.
What data is available for Grok 4.1 Fast and Qwen3.5 397B today?
Grok 4.1 Fast: $0.20 input / $0.50 output per 1M tokens Qwen3.5 397B: $0.60 input / $3.60 output per 1M tokens Both model pages still include creator, context window, reasoning mode, and other metadata while benchmark coverage fills in.
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