Model comparison
Gemini 3.6 Flash vs Grok 4 Fast (Reasoning)
Head-to-head evidence from 10 shared benchmark results across 4 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Gemini 3.6 Flash unranked (Not scored); Grok 4 Fast (Reasoning) #76 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Gemini 3.6 Flash and Grok 4 Fast (Reasoning) share 10 comparable benchmark results. 0 of 8 categories are comparable. 9 results are unique to Gemini 3.6 Flash; 3 to Grok 4 Fast (Reasoning).
Updated July 21, 2026- Shared results
- 10
- Gemini 3.6 Flash only
- 9
- Grok 4 Fast (Reasoning) only
- 3
- Comparable categories
- 0 / 8
Benchmark data for Gemini 3.6 Flash and Grok 4 Fast (Reasoning) is coming soon on BenchLM.
Confidence note. This is a partial-evidence comparison with 10 shared benchmark results across 4 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 Fast (Reasoning) has the larger context window at 2M, compared with 1M for Gemini 3.6 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 | Gemini 3.6 Flash | Δ | Grok 4 Fast (Reasoning) |
|---|---|---|---|
| Agentic | Gemini 3.6 Flash83.0 | MarginNo overlap | Grok 4 Fast (Reasoning)Not measured |
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Gemini 3.6 Flash | Grok 4 Fast (Reasoning) | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Gemini 3.6 Flash$1.5 input / $7.5 output | Grok 4 Fast (Reasoning)Not available | A complete price comparison is not available. |
| Generation speedtokens per second | Gemini 3.6 FlashNot available | Grok 4 Fast (Reasoning)Not available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Gemini 3.6 FlashNot available | Grok 4 Fast (Reasoning)Not available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Gemini 3.6 Flash1M | Grok 4 Fast (Reasoning)2M | Grok 4 Fast (Reasoning) lists the larger context window. |
Benchmark Deep Dive
Agentic8 benchmarks
| Benchmark | Gemini 3.6 Flash | Grok 4 Fast (Reasoning) | Result |
|---|---|---|---|
| OSWorld-VerifiedSource | 83% | — | Not comparable |
| GDPval-AASource | 1421 | — | Not comparable |
| AA Agentic IndexSource | 38.7% | — | Not comparable |
| GDPval-AASource | 46.1% | — | Not comparable |
| AA BriefcaseSource | 961 | — | Not comparable |
| AA Tau3 BankingSource | 24.5% | — | Not comparable |
| aaTerminalBench21Source | 77.5% | — | Not comparable |
| τ²-bench resultsSource | — | 65.8% | Not comparable |
Coding4 benchmarks
Reasoning2 benchmarks
Knowledge6 benchmarks
| Benchmark | Gemini 3.6 Flash | Grok 4 Fast (Reasoning) | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 50.1% | 27.4% | Gemini 3.6 Flash leads |
| AA-GPQA DiamondSource | 92.8% | 84.7% | Gemini 3.6 Flash leads |
| AA-HLESource | 38.3% | 17.0% | Gemini 3.6 Flash leads |
| AA-Omniscience IndexSource | 23.5% | -28.4% | Gemini 3.6 Flash leads |
| AA-Omniscience AccuracySource | 50.2% | 22.6% | Gemini 3.6 Flash leads |
| AA-Omniscience Hallucination RateSource | 53.5% | 66.0% | Gemini 3.6 Flash leads |
Multimodal1 benchmarks
| Benchmark | Gemini 3.6 Flash | Grok 4 Fast (Reasoning) | Result |
|---|---|---|---|
| AA-MMMU-ProSource | 83.2% | 61.8% | Gemini 3.6 Flash leads |
Inst. Following1 benchmarks
| Benchmark | Gemini 3.6 Flash | Grok 4 Fast (Reasoning) | Result |
|---|---|---|---|
| AA-IFBenchSource | — | 50.5% | Not comparable |
Frequently Asked Questions (3)
Can I compare Gemini 3.6 Flash and Grok 4 Fast (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 Gemini 3.6 Flash and Grok 4 Fast (Reasoning) today?
Gemini 3.6 Flash: $1.50 input / $7.50 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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