Gemini 4 Carbon
GoogleProprietaryPreliminaryReleased Oct 28, 2026
On the arena.ai Agents leaderboard, Gemini 4 Carbon has a Net Improvement of 16.04% (High, rank #2, 95% interval 15.04%–17.04%). Gemini 4 Carbon ranks #1 on the LMArena Text leaderboard (style control) with an Arena score of 1527.5 (±9.4, 4,403 votes). It has few votes so far, so this is a preliminary result and the rank may move. Artificial Analysis Intelligence Index: 59.4. API price: $4.00 input / $20.00 output per 1M tokens. Next is Gemini 4 Argon (1520.3), 7.2 points behind.
Quick answer
- Agents leaderboard
- #2 of 37 · 16.04% success
- Text (LMArena)
- #1 · 1527.5
- 17NAS overall
- #2 of 36
- API price (in / out)
- $4.00 / $20.00 per 1M tokens
- Closest rival
- Gemini 4 Argon · 1520.3
- Data updated
- Oct 29, 2026 · synced daily
Sources: arena.ai, LMArena, Artificial Analysis, OpenRouter
Key metrics
Models ranked nearby
Sorted by Arena score| # | Model | Arena | Intel. | Output $ | tok/s |
|---|---|---|---|---|---|
| 1 | Gemini 4 CarbonThis page | 1527.5 | 59.4 | $20.00 | 88 |
| 2 | Gemini 4 Argon | 1520.3 | 50.4 | $20.00 | 80 |
| 3 |  Claude Opus 5.5 | 1508.7 | 58.4 | $20.00 | 96 |
| 4 |  Muse Wonder | 1507.1 | 43.3 | $20.00 | 181 |
More from Google
| # | Model | Arena | Intel. | Output $ | tok/s |
|---|---|---|---|---|---|
| 2 | Gemini 4 Argon | 1520.3 | 50.4 | $20.00 | 80 |
| 9 | Gemini 3.8 Flash | 1495.9 | 30.5 | $3.75 | 133 |
| 14 | Gemini 3.7 Flash | 1489.6 | – | $3.75 | – |
| 17 | Gemini 3.1 Pro Preview | 1486.9 | – | $12.00 | 140 |
| 18 | Gemini 3 Pro | 1485.4 | – | $12.00 | – |
| 20 | Gemini 3.6 Flash | 1483.2 | – | $3.75 | – |
Pricing
- Official API list price: $4.00 input and $20.00 output per 1M tokens (USD).
- At a typical 3:1 input-to-output ratio, the blended cost is about $8.00 per 1M tokens.
- Among 67 models with an output price, it is the #53 cheapest.
Sources & methodology
On the arena.ai Agents leaderboard, Gemini 4 Carbon has a Net Improvement of 16.04% (High, rank #2, 95% interval 15.04%–17.04%).
- arena.ai Agents — agent Net Improvement, 95% interval, sessions and rank (via the public Hugging Face dataset, CC BY 4.0).
- LMArena — Arena score (Text leaderboard with style control, the same view arena.ai shows by default), 95% confidence interval, votes and rank.
- Artificial Analysis — Intelligence / Coding Index, output speed and latency (medians).
- OpenRouter — Route prices, context length and listing date.
Arena scores use the Bradley-Terry model (not Elo); ± is the half-width of the 95% confidence interval. Latency figures are Artificial Analysis medians; for reasoning models, time to first token and to first answer include the thinking phase. Data syncs daily at 14:20 (UTC+8).
Limits: Arena scores come from anonymous users voting on chats, so they reflect conversational preference rather than agent or coding benchmarks; with few votes the interval is wide and ranks move. Prices and speeds change as providers update them.
FAQ
How does Gemini 4 Carbon do on the Agents leaderboard?
On the arena.ai Agents leaderboard, Gemini 4 Carbon has a Net Improvement of 16.04% (High, rank #2, 95% interval 15.04%–17.04%).
What rank is Gemini 4 Carbon right now?
Gemini 4 Carbon is #1 on our leaderboard of 63 scored models (Arena score 1527.5); its raw LMArena rank is #1.
What does Gemini 4 Carbon cost via API?
Input $4.00 / output $20.00 per 1M tokens (official API list price; the OpenRouter quote when no official price is available). At a typical 3:1 input-to-output ratio, the blended cost is about $8.00 per 1M tokens.
How fast is Gemini 4 Carbon?
Artificial Analysis measures about 88 output tokens per second, 66 s to the first token and 66 s to the first answer token; it is a reasoning model, so latency includes thinking time.
Why is Gemini 4 Carbon marked Preliminary?
It has only 4,403 votes on LMArena and a 95% confidence interval of ±9.4; with few votes the score can move noticeably as new votes arrive, so treat the rank as provisional. We mark models with fewer than 5,000 votes or ± above 10 as Preliminary.
Is Gemini 4 Carbon open source? Can it be self-hosted?
Gemini 4 Carbon is a closed model, available only via official APIs or hosted services.
Gemini 4 Carbon vs Gemini 4 Argon: which is better?
On the LMArena Text leaderboard Gemini 4 Carbon scores 1527.5 and Gemini 4 Argon scores 1520.3 (a 7.2-point gap, within the confidence interval, so not significant). Agent task success: Gemini 4 Carbon 16.04%, Gemini 4 Argon 10.73%. On price, Gemini 4 Carbon costs $20.00 and Gemini 4 Argon $20.00 per 1M output tokens.
Is there a cheaper model close to Gemini 4 Carbon?
Among models within 15 Text points, none is currently more than 30% cheaper than Gemini 4 Carbon on output price.
Where does the Gemini 4 Carbon data come from and how often is it updated?
Agent success rates come from the arena.ai Agents leaderboard (CC BY 4.0), Text scores from LMArena, intelligence and speed from Artificial Analysis, and prices and context from official list prices and OpenRouter. 17NAS syncs daily at 06:20 UTC; this page was last updated Oct 29, 2026.