Model comparison
Grok 4.20 vs Qwen3.5 397B (Reasoning)
Head-to-head evidence from 0 shared benchmark results across 0 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Grok 4.20 #93 (Estimated); Qwen3.5 397B (Reasoning) #62 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Grok 4.20 and Qwen3.5 397B (Reasoning) share 0 comparable benchmark results. 0 of 8 categories are comparable. 19 results are unique to Grok 4.20; 17 to Qwen3.5 397B (Reasoning).
Updated July 28, 2026- Shared results
- 0
- Grok 4.20 only
- 19
- Qwen3.5 397B (Reasoning) only
- 17
- Comparable categories
- 0 / 8
Benchmark data for Grok 4.20 and Qwen3.5 397B (Reasoning) is coming soon on BenchLM.
Confidence note. This is a partial-evidence comparison with 0 shared benchmark results across 0 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.
Grok 4.20 is priced at $2.00 input / $6.00 output per 1M tokens, versus $0.60 input / $3.60 output per 1M tokens for Qwen3.5 397B (Reasoning). Grok 4.20 has the larger context window at 2M, compared with 128K for Qwen3.5 397B (Reasoning).
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Grok 4.20 | Qwen3.5 397B (Reasoning) | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Grok 4.20$2 input / $6 output | Qwen3.5 397B (Reasoning)$0.6 input / $3.6 output | Qwen3.5 397B (Reasoning) has the lower combined listed price. |
| Generation speedtokens per second | Grok 4.20233 tok/s | Qwen3.5 397B (Reasoning)Not available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Grok 4.2010.33 s | Qwen3.5 397B (Reasoning)Not available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Grok 4.202M | Qwen3.5 397B (Reasoning)128K | Grok 4.20 lists the larger context window. |
Benchmark Deep Dive
Agentic8 benchmarks
| Benchmark | Grok 4.20 | Qwen3.5 397B (Reasoning) | Result |
|---|---|---|---|
| Terminal-Bench 2.0Source | 47.1% | — | Not comparable |
| DeepSearchQASource | 62.8% | — | Not comparable |
| Gert LabsSource | 38.36% | — | Not comparable |
| AA Agentic IndexSource | — | 19.9% | Not comparable |
| APEX-Agents-AASource | — | 15.3% | Not comparable |
| τ²-bench resultsSource | — | 95.6% | Not comparable |
| GDPval-AASource | — | 23.1% | Not comparable |
| GDPval-AASource | — | 962 | Not comparable |
Coding6 benchmarks
Reasoning4 benchmarks
Knowledge10 benchmarks
| Benchmark | Grok 4.20 | Qwen3.5 397B (Reasoning) | Result |
|---|---|---|---|
| GPQA-DSource | 88.5% | — | Not comparable |
| HLE w/o toolsSource | 31.6% | — | Not comparable |
| HealthBench HardSource | 20.3% | — | Not comparable |
| MedXpertQA (Text)Source | 50.2% | — | Not comparable |
| Artificial Analysis Intelligence IndexSource | — | 33.7% | Not comparable |
| AA-GPQA DiamondSource | — | 89.3% | Not comparable |
| AA-HLESource | — | 27.3% | Not comparable |
| AA-Omniscience IndexSource | — | -29.8% | Not comparable |
| AA-Omniscience AccuracySource | — | 31.4% | Not comparable |
| AA-Omniscience Hallucination RateSource | — | 89.1% | Not comparable |
Multimodal7 benchmarks
| Benchmark | Grok 4.20 | Qwen3.5 397B (Reasoning) | Result |
|---|---|---|---|
| MMMU-ProSource | 75.2% | — | Not comparable |
| CharXivSource | 60.9% | — | Not comparable |
| ERQASource | 54.1% | — | Not comparable |
| SimpleVQASource | 57.4% | — | Not comparable |
| MedXpertQA (MM)Source | 65.8% | — | Not comparable |
| Design Arena WebsiteSource | 1252 | — | Not comparable |
| AA-MMMU-ProSource | — | 77.3% | Not comparable |
Inst. Following1 benchmarks
| Benchmark | Grok 4.20 | Qwen3.5 397B (Reasoning) | Result |
|---|---|---|---|
| AA-IFBenchSource | — | 78.8% | Not comparable |
Frequently Asked Questions (3)
Can I compare Grok 4.20 and Qwen3.5 397B (Reasoning) 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 4.20 and Qwen3.5 397B (Reasoning) today?
Grok 4.20: $2.00 input / $6.00 output per 1M tokens Qwen3.5 397B (Reasoning): $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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