Model comparison
Grok 4.1 Fast (Reasoning) vs Step 3.7 Flash
Head-to-head evidence from 13 shared benchmark results across 6 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
BenchAlign evidence: Grok 4.1 Fast (Reasoning) supported; Step 3.7 Flash estimated. Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Grok 4.1 Fast (Reasoning) and Step 3.7 Flash share 13 comparable benchmark results. 0 of 8 categories are comparable. 1 result is unique to Grok 4.1 Fast (Reasoning); 17 to Step 3.7 Flash.
Updated July 16, 2026- Shared results
- 13
- Grok 4.1 Fast (Reasoning) only
- 1
- Step 3.7 Flash only
- 17
- Comparable categories
- 0 / 8
Benchmark data for Grok 4.1 Fast (Reasoning) and Step 3.7 Flash 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.
Grok 4.1 Fast (Reasoning) has the larger context window at 2M, compared with 256K for Step 3.7 Flash.
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 (Reasoning) | Δ | Step 3.7 Flash |
|---|---|---|---|
| Agentic | Grok 4.1 Fast (Reasoning)Not measured | MarginNo overlap | Step 3.7 Flash66.4 |
| Coding | Grok 4.1 Fast (Reasoning)Not measured | MarginNo overlap | Step 3.7 Flash56.3 |
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Grok 4.1 Fast (Reasoning) | Step 3.7 Flash | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Grok 4.1 Fast (Reasoning)Not available | Step 3.7 Flash$0.2 input / $1.15 output | A complete price comparison is not available. |
| Generation speedtokens per second | Grok 4.1 Fast (Reasoning)Not available | Step 3.7 FlashNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Grok 4.1 Fast (Reasoning)Not available | Step 3.7 FlashNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Grok 4.1 Fast (Reasoning)2M | Step 3.7 Flash256K | Grok 4.1 Fast (Reasoning) lists the larger context window. |
Benchmark Deep Dive
Agentic12 benchmarks
| Benchmark | Grok 4.1 Fast (Reasoning) | Step 3.7 Flash | Result |
|---|---|---|---|
| τ²-bench resultsSource | 93.3% | 98.5% | Step 3.7 Flash leads |
| Terminal-Bench 2.0Source | — | 59.5% | Not comparable |
| BrowseCompSource | — | 75.8% | Not comparable |
| DeepSearchQASource | — | 92.8% | Not comparable |
| GDPval-AASource | — | 25.9% | Not comparable |
| ToolathlonSource | — | 49.5% | Not comparable |
| Claw-EvalSource | — | 67.1% | Not comparable |
| HLE w/ toolsSource | — | 47.2% | Not comparable |
| Gert LabsSource | — | 51.57% | Not comparable |
| AA Agentic IndexSource | — | 21.5% | Not comparable |
| GDPval-AASource | — | 1017 | Not comparable |
| APEX-Agents-AASource | — | 14.8% | Not comparable |
Coding6 benchmarks
| Benchmark | Grok 4.1 Fast (Reasoning) | Step 3.7 Flash | Result |
|---|---|---|---|
| Vibe Code BenchSource | 1.20% | — | Not comparable |
| Terminal-Bench HardSource | 24.2% | 35.6% | Step 3.7 Flash leads |
| AA-SciCodeSource | 44.2% | 40.0% | Grok 4.1 Fast (Reasoning) leads |
| SWE-bench ProSource | — | 56.3% | Not comparable |
| Terminal-Bench 2.0Source | — | 59.5% | Not comparable |
| AA Coding IndexSource | — | 39.6% | Not comparable |
Reasoning2 benchmarks
Knowledge6 benchmarks
| Benchmark | Grok 4.1 Fast (Reasoning) | Step 3.7 Flash | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 30.6% | 30.3% | Grok 4.1 Fast (Reasoning) leads |
| AA-GPQA DiamondSource | 85.3% | 80.9% | Grok 4.1 Fast (Reasoning) leads |
| AA-HLESource | 17.6% | 19.9% | Step 3.7 Flash leads |
| AA-Omniscience IndexSource | -28.7% | -37.5% | Grok 4.1 Fast (Reasoning) leads |
| AA-Omniscience AccuracySource | 25.3% | 25.4% | Step 3.7 Flash leads |
| AA-Omniscience Hallucination RateSource | 72.4% | 84.4% | Grok 4.1 Fast (Reasoning) leads |
Multimodal4 benchmarks
Inst. Following1 benchmarks
| Benchmark | Grok 4.1 Fast (Reasoning) | Step 3.7 Flash | Result |
|---|---|---|---|
| AA-IFBenchSource | 52.7% | 67.3% | Step 3.7 Flash leads |
Frequently Asked Questions (3)
Can I compare Grok 4.1 Fast (Reasoning) and Step 3.7 Flash 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 (Reasoning) and Step 3.7 Flash today?
Step 3.7 Flash: $0.20 input / $1.15 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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