Model comparison
Grok Code Fast 1 vs Qwen3.5 397B (Reasoning)
Head-to-head evidence from 11 shared benchmark results across 5 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Grok Code Fast 1 #180 (Supported); Qwen3.5 397B (Reasoning) #56 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Grok Code Fast 1 and Qwen3.5 397B (Reasoning) share 11 comparable benchmark results. 0 of 8 categories are comparable. 1 result is unique to Grok Code Fast 1; 6 to Qwen3.5 397B (Reasoning).
Updated July 20, 2026- Shared results
- 11
- Grok Code Fast 1 only
- 1
- Qwen3.5 397B (Reasoning) only
- 6
- Comparable categories
- 0 / 8
Benchmark data for Grok Code Fast 1 and Qwen3.5 397B (Reasoning) is coming soon on BenchLM.
Confidence note. This is a partial-evidence comparison with 11 shared benchmark results across 5 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 (Reasoning) is priced at $0.60 input / $3.60 output per 1M tokens, versus $0.20 input / $1.50 output per 1M tokens for Grok Code Fast 1. Grok Code Fast 1 has the larger context window at 256K, compared with 128K for Qwen3.5 397B (Reasoning).
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 Code Fast 1 | Δ | Qwen3.5 397B (Reasoning) |
|---|---|---|---|
| Coding | Grok Code Fast 170.8 | MarginNo overlap | Qwen3.5 397B (Reasoning)Not measured |
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Grok Code Fast 1 | Qwen3.5 397B (Reasoning) | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Grok Code Fast 1$0.2 input / $1.5 output | Qwen3.5 397B (Reasoning)$0.6 input / $3.6 output | Grok Code Fast 1 has the lower combined listed price. |
| Generation speedtokens per second | Grok Code Fast 1172 tok/s | Qwen3.5 397B (Reasoning)Not available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Grok Code Fast 12.81 s | Qwen3.5 397B (Reasoning)Not available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Grok Code Fast 1256K | Qwen3.5 397B (Reasoning)128K | Grok Code Fast 1 lists the larger context window. |
Benchmark Deep Dive
Agentic5 benchmarks
Coding3 benchmarks
Reasoning2 benchmarks
Knowledge6 benchmarks
| Benchmark | Grok Code Fast 1 | Qwen3.5 397B (Reasoning) | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 21.6% | 33.7% | Qwen3.5 397B (Reasoning) leads |
| AA-GPQA DiamondSource | 72.7% | 89.3% | Qwen3.5 397B (Reasoning) leads |
| AA-HLESource | 7.5% | 27.3% | Qwen3.5 397B (Reasoning) leads |
| AA-Omniscience IndexSource | -36.0% | -29.8% | Qwen3.5 397B (Reasoning) leads |
| AA-Omniscience AccuracySource | 23.8% | 31.4% | Qwen3.5 397B (Reasoning) leads |
| AA-Omniscience Hallucination RateSource | 78.5% | 89.1% | Grok Code Fast 1 leads |
Multimodal1 benchmarks
| Benchmark | Grok Code Fast 1 | Qwen3.5 397B (Reasoning) | Result |
|---|---|---|---|
| AA-MMMU-ProSource | — | 77.3% | Not comparable |
Inst. Following1 benchmarks
| Benchmark | Grok Code Fast 1 | Qwen3.5 397B (Reasoning) | Result |
|---|---|---|---|
| AA-IFBenchSource | 41.4% | 78.8% | Qwen3.5 397B (Reasoning) leads |
Frequently Asked Questions (3)
Can I compare Grok Code Fast 1 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 Code Fast 1 and Qwen3.5 397B (Reasoning) today?
Grok Code Fast 1: $0.20 input / $1.50 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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