Model comparison
Gemini 3.1 Flash-Lite vs Grok 4.1 Fast
Head-to-head evidence from 13 shared benchmark results across 6 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Gemini 3.1 Flash-Lite #111 (Supported); Grok 4.1 Fast #107 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Gemini 3.1 Flash-Lite and Grok 4.1 Fast share 13 comparable benchmark results. 0 of 8 categories are comparable. 7 results are unique to Gemini 3.1 Flash-Lite; 0 to Grok 4.1 Fast.
Updated July 20, 2026- Shared results
- 13
- Gemini 3.1 Flash-Lite only
- 7
- Grok 4.1 Fast only
- 0
- Comparable categories
- 0 / 8
Benchmark data for Gemini 3.1 Flash-Lite and Grok 4.1 Fast 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.
Gemini 3.1 Flash-Lite is priced at $0.25 input / $1.50 output per 1M tokens, versus $0.20 input / $0.50 output per 1M tokens for Grok 4.1 Fast.
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 3.1 Flash-Lite | Δ | Grok 4.1 Fast |
|---|---|---|---|
| Multimodal | Gemini 3.1 Flash-Lite73.2 | MarginNo overlap | Grok 4.1 FastNot measured |
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Gemini 3.1 Flash-Lite | Grok 4.1 Fast | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Gemini 3.1 Flash-Lite$0.25 input / $1.5 output | Grok 4.1 Fast$0.2 input / $0.5 output | Grok 4.1 Fast has the lower combined listed price. |
| Generation speedtokens per second | Gemini 3.1 Flash-Lite205 tok/s | Grok 4.1 Fast138 tok/s | Gemini 3.1 Flash-Lite has the higher measured throughput. |
| First-answer latencyseconds to first token | Gemini 3.1 Flash-Lite7.50 s | Grok 4.1 Fast0.54 s | Grok 4.1 Fast reaches the first token sooner. |
| Context windowmaximum listed tokens | Gemini 3.1 Flash-Lite1M | Grok 4.1 Fast1M | Listed context windows are equal. |
Benchmark Deep Dive
Agentic6 benchmarks
| Benchmark | Gemini 3.1 Flash-Lite | Grok 4.1 Fast | Result |
|---|---|---|---|
| AA Agentic IndexSource | 6.2% | — | Not comparable |
| APEX-Agents-AASource | 12.2% | — | Not comparable |
| τ²-bench resultsSource | 31.3% | 63.7% | Grok 4.1 Fast leads |
| GDPval-AASource | 7.1% | — | Not comparable |
| GDPval-AASource | 642 | — | Not comparable |
| Gert LabsSource | 38.46% | 47.32% | Grok 4.1 Fast leads |
Coding3 benchmarks
Reasoning2 benchmarks
Knowledge6 benchmarks
| Benchmark | Gemini 3.1 Flash-Lite | Grok 4.1 Fast | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 25.0% | 16.9% | Gemini 3.1 Flash-Lite leads |
| AA-GPQA DiamondSource | 82.2% | 63.7% | Gemini 3.1 Flash-Lite leads |
| AA-HLESource | 16.2% | 5.0% | Gemini 3.1 Flash-Lite leads |
| AA-Omniscience IndexSource | -15.5% | -50.9% | Gemini 3.1 Flash-Lite leads |
| AA-Omniscience AccuracySource | 36.4% | 17.0% | Gemini 3.1 Flash-Lite leads |
| AA-Omniscience Hallucination RateSource | 81.6% | 81.8% | Gemini 3.1 Flash-Lite leads |
Multimodal2 benchmarks
Inst. Following1 benchmarks
| Benchmark | Gemini 3.1 Flash-Lite | Grok 4.1 Fast | Result |
|---|---|---|---|
| AA-IFBenchSource | 77.2% | 36.5% | Gemini 3.1 Flash-Lite leads |
Frequently Asked Questions (3)
Can I compare Gemini 3.1 Flash-Lite and Grok 4.1 Fast 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 3.1 Flash-Lite and Grok 4.1 Fast today?
Gemini 3.1 Flash-Lite: $0.25 input / $1.50 output per 1M tokens Grok 4.1 Fast: $0.20 input / $0.50 output per 1M tokens Both model pages still include creator, context window, reasoning mode, and other metadata while benchmark coverage fills in.
Related Comparisons
Explore More
Choose a model with this week’s evidence
Join 2,000+ readers for ranking moves, pricing changes, and the claims that still need proof.
One email each week. Unsubscribe anytime.