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Gemini 3.8 Flash vs Grok 4.6
Of the 4 public leaderboards that rate both, Gemini 3.8 Flash scores higher on 2 and Grok 4.6 on 2. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Gemini 3.8 Flash is at 42.2 and Grok 4.6 at 51.4 (out of 100). On each maker's API, Gemini 3.8 Flash costs $0.75 / $3.75 per 1M tokens (input / output) and Grok 4.6 $2 / $6.
Scores as published by each board; table composed November 12, 2026.
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Leaderboard by leaderboard
| Board | Gemini 3.8 Flash | Grok 4.6 | Higher |
|---|---|---|---|
| LMArena Elo (community votes) | 1,582.6 | 1,618 | Grok 4.6 |
| LiveBench global average (0-100) | 57.3 | 63.5 | Grok 4.6 |
| SimpleBench AVG@5 % (private set) | 82.4 | 75.9 | Gemini 3.8 Flash |
| Epoch AI Epoch Capabilities Index (ECI) · many benchmarks on one scale | 158.8 | 157.8 | Gemini 3.8 Flash |
Raw scores are each board's own scale, so compare within a row, not across rows. Full table: the bench index.
For coding
On the ArtificialWatch coding index, Gemini 3.8 Flash is at 44.4 (#22 of 47) and Grok 4.6 at 34.7 (#31). Gemini 3.8 Flash scores higher on 2 of the 3 coding boards that rate both and Grok 4.6 on 1.
| Coding board | Gemini 3.8 Flash | Grok 4.6 |
|---|---|---|
| LMArena · Coding | 1,510.6 | 1,463.8 |
| LiveBench · Coding | 73.3 | 76.7 |
| Vals Vibe Code Bench | 78.7 | 76.2 |
Gemini 3.8 Flash at a glance
- Developer
- Status
- Live since September 2, 2026
- API price
- $0.75 input / $3.75 output per 1M tokens · Google, gemini-3.8-flash
- Context window
- 1.05M tokens
Live — GA Sep 2 · $0.75/$3.75 per 1M introductory through Dec 31, identical to 3.7 · 1M in / 64K out · 'our most intelligent Flash model' · 20 days after 3.7.
Gemini 3.8 Flash is GA — same price as 3.7, twenty days later
2026-09-02 · Google released Gemini 3.8 Flash today. The Gemini API changelog for September 2 reads: "Gemini 3.8 Flash generally available (GA): Released gemini-3.8-flash, our most intelligent Flash model, engineered for long-horizon software engineering, autonomous agents, and complex enterprise workflows."
Grok 4.6 at a glance
- Developer
- xAI
- Status
- Live since August 12, 2026
- API price
- $2 input / $6 output per 1M tokens · xAI, grok-4.6
- Context window
- 500K tokens
Live — Aug 12 at $2/$6 per 1M, unchanged from Grok 4.5.
Gemini 3.8 Flash vs Grok 4.6: quick answers
Which is better, Gemini 3.8 Flash or Grok 4.6?
It depends on what you measure. Of the 4 public leaderboards that rate both, Gemini 3.8 Flash scores higher on 2 and Grok 4.6 on 2. Gemini 3.8 Flash's widest lead is on SimpleBench; Grok 4.6's widest lead is on LiveBench. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Gemini 3.8 Flash is at 42.2 and Grok 4.6 at 51.4 (out of 100).
Which is newer, Gemini 3.8 Flash or Grok 4.6?
Gemini 3.8 Flash. It went live on September 2, 2026, 21 days after Grok 4.6 (August 12, 2026).
Which is cheaper, Gemini 3.8 Flash or Grok 4.6?
Gemini 3.8 Flash is cheaper on both input and output. On each vendor's own API, Gemini 3.8 Flash is $0.75 input / $3.75 output per million tokens and Grok 4.6 is $2 input / $6 output per million tokens. Grok 4.6's rate rises for prompts over 200K tokens. Prices as published in the models.dev catalog, as of 2026-11-12.
Which has the bigger context window, Gemini 3.8 Flash or Grok 4.6?
Gemini 3.8 Flash, at 1.05M tokens against Grok 4.6's 500K, as each vendor lists it.
How do Gemini 3.8 Flash and Grok 4.6 compare for coding?
On the ArtificialWatch coding index, Gemini 3.8 Flash is at 44.4 (#22 of 47) and Grok 4.6 at 34.7 (#31). Gemini 3.8 Flash scores higher on 2 of the 3 coding boards that rate both and Grok 4.6 on 1.
Who makes Gemini 3.8 Flash and Grok 4.6?
Gemini 3.8 Flash is from Google; Grok 4.6 is from xAI.
Where do these numbers come from?
Each score is the leaderboard's own published figure, read by ArtificialWatch (table composed November 12, 2026). Boards measure different things, so raw scores are only comparable within a row.
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Also: the bench index · API pricing · what a workload costs on each · the wire