Model comparison
Grok 4.1 Fast vs Step 3.7 Flash
Head-to-head evidence from 14 shared benchmark results across 6 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
BenchAlign evidence: Grok 4.1 Fast 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 and Step 3.7 Flash share 14 comparable benchmark results. 0 of 8 categories are comparable. 0 results are unique to Grok 4.1 Fast; 16 to Step 3.7 Flash.
Updated July 16, 2026- Shared results
- 14
- Grok 4.1 Fast only
- 0
- Step 3.7 Flash only
- 16
- Comparable categories
- 0 / 8
Benchmark data for Grok 4.1 Fast and Step 3.7 Flash is coming soon on BenchLM.
Confidence note. This is a partial-evidence comparison with 14 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.
Step 3.7 Flash is priced at $0.20 input / $1.15 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 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 | Δ | Step 3.7 Flash |
|---|---|---|---|
| Agentic | Grok 4.1 FastNot measured | MarginNo overlap | Step 3.7 Flash66.4 |
| Coding | Grok 4.1 FastNot 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 | Step 3.7 Flash | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Grok 4.1 Fast$0.2 input / $0.5 output | Step 3.7 Flash$0.2 input / $1.15 output | Grok 4.1 Fast has the lower combined listed price. |
| Generation speedtokens per second | Grok 4.1 Fast138 tok/s | Step 3.7 FlashNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Grok 4.1 Fast0.54 s | Step 3.7 FlashNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Grok 4.1 Fast1M | Step 3.7 Flash256K | Grok 4.1 Fast lists the larger context window. |
Benchmark Deep Dive
Agentic12 benchmarks
| Benchmark | Grok 4.1 Fast | Step 3.7 Flash | Result |
|---|---|---|---|
| τ²-bench resultsSource | 63.7% | 98.5% | Step 3.7 Flash leads |
| Gert LabsSource | 47.32% | 51.57% | 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 |
| AA Agentic IndexSource | — | 21.5% | Not comparable |
| GDPval-AASource | — | 1017 | Not comparable |
| APEX-Agents-AASource | — | 14.8% | Not comparable |
Coding5 benchmarks
Reasoning2 benchmarks
Knowledge6 benchmarks
| Benchmark | Grok 4.1 Fast | Step 3.7 Flash | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 16.9% | 30.3% | Step 3.7 Flash leads |
| AA-GPQA DiamondSource | 63.7% | 80.9% | Step 3.7 Flash leads |
| AA-HLESource | 5.0% | 19.9% | Step 3.7 Flash leads |
| AA-Omniscience IndexSource | -50.9% | -37.5% | Step 3.7 Flash leads |
| AA-Omniscience AccuracySource | 17.0% | 25.4% | Step 3.7 Flash leads |
| AA-Omniscience Hallucination RateSource | 81.8% | 84.4% | Grok 4.1 Fast leads |
Multimodal4 benchmarks
Inst. Following1 benchmarks
| Benchmark | Grok 4.1 Fast | Step 3.7 Flash | Result |
|---|---|---|---|
| AA-IFBenchSource | 36.5% | 67.3% | Step 3.7 Flash leads |
Frequently Asked Questions (3)
Can I compare Grok 4.1 Fast 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 and Step 3.7 Flash today?
Grok 4.1 Fast: $0.20 input / $0.50 output per 1M tokens 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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