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Step 5 PreviewGemini 3.8 Flash vs Gemini 3.1 Pro Preview
- Gemini 3.8 Flash rates higher on LMArena’s text leaderboard: 1498 against 1480.
- Gemini 3.8 Flash is cheaper: $0.82 / $4.13 per million input / output tokens, against $2 / $12 for Gemini 3.1 Pro Preview.
- On the 11 Vals AI benchmarks both have taken, Gemini 3.8 Flash wins 8 and Gemini 3.1 Pro Preview wins 3 (Gemini 3.8 Flash: Terminal-Bench 4.0, SWE-bench, Vibe Code Bench).
LatestGemini 3.1 Pro Preview 1480
Side by side
Models (2/6)
- Gemini 3.8 Flash
- Gemini 3.1 Pro Preview
| Benchmark | Gemini 3.8 Flash | Gemini 3.1 Pro Preview |
|---|---|---|
| The model | ||
| Lab | ||
| Released | 2026-09-02 | 2026-02-19 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | 1M |
| Input, per 1M tokens | $0.82 | $2 |
| Output, per 1M tokens | $4.13 | $12 |
| LMArena, people’s votes | ||
| LMArena TextMillions of people compare two anonymous models side by side and vote for the better answer | 1498#8 of 351 | 1480#19 of 351 |
| LMArena WebDevPeople ask two anonymous models to build the same web app, try both and vote for the better one | 1585#36 of 124 | 1447#78 of 124 |
| LMArena VisionSide-by-side votes on prompts that include an image | 1315#7 of 146 | 1296#22 of 146 |
| LMArena CodingLMArena’s text votes on prompts that ask for code | 1508#17 of 346 | 1484#48 of 346 |
| LMArena MathLMArena’s text votes on math prompts | 1532#4 of 339 | 1486#28 of 339 |
| LMArena Creative writingLMArena’s text votes on stories, poems and other creative writing | 1489#8 of 349 | 1482#14 of 349 |
| LMArena Hard promptsLMArena’s text votes on the hardest prompts | 1509#9 of 351 | 1485#30 of 351 |
| LMArena Instruction followingLMArena’s text votes on prompts with specific instructions to follow | 1492#11 of 351 | 1466#35 of 351 |
| Vals AI, overall | ||
| Vals IndexVals AI’s headline score | 55.95%#15 of 27 | — |
| Vals AI, coding | ||
| Terminal-Bench 4.0Frontier-difficulty tasks an agent completes in a real terminal | 19.70%#31 of 55 | 2.52%#49 of 55 |
| SWE-benchReal GitHub issues from open-source projects | 80.00%#23 of 85 | 78.80%#28 of 85 |
| Vibe Code BenchBuilding complete web apps from a plain-language brief, graded on whether the app works | 78.65%#29 of 115 | 32.03%#72 of 115 |
| Code MigrationRewriting working programs in a new language, graded on whether the new program still passes its tests | 38.65%#22 of 28 | — |
| LiveCodeBenchFresh competitive programming problems, collected after models’ training cut-offs to avoid contamination | 89.48%#3 of 143 | 88.48%#6 of 143 |
| Vals AI, finance | ||
| Finance AgentThe core tasks of a financial analyst, done as an agent with research tools | 65.76%#5 of 31 | — |
| Finance IndexVals AI’s composite of finance tasks | 60.46%#9 of 31 | — |
| Tax Agent BenchAgentic research into US corporate tax questions | 32.12%#21 of 76 | 9.29%#62 of 76 |
| Vals AI, law | ||
| Legal IndexVals AI’s composite of legal tasks | 69.78%#14 of 28 | — |
| Legal Research BenchAgentic US legal research | 38.94%#34 of 85 | 20.67%#62 of 85 |
| Vals AI, medicine | ||
| MedCodeAssigning the right medical billing codes from clinical notes | 48.13%#31 of 107 | 59.06%#2 of 107 |
| MedQAMedical licensing exam questions, measured on accuracy and on robustness to bias | — | 96.37%#3 of 92 |
| Vals AI, reasoning | ||
| GPQA DiamondGraduate-level questions in biology, physics and chemistry that experts answer well and search does not | 94.44%#4 of 138 | 95.45%#1 of 138 |
| MMLU-ProHarder, reasoning-focused multiple choice across 14 subjects, from law to engineering | 90.22%#5 of 138 | 90.99%#4 of 138 |
| AIMEProblems from the American Invitational Mathematics Examination, a qualifier for the US Math Olympiad | — | 98.13%#1 of 96 |
| MMMUCollege-level questions that need both an image and text | 89.08%#4 of 93 | 88.21%#10 of 93 |
| Terminal-Bench ScienceExpert-written scientific research workflows, run by an agent in a terminal | 8.57%#19 of 42 | 1.43%#35 of 42 |
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Questions
Which is better, Gemini 3.8 Flash or Gemini 3.1 Pro Preview?
Gemini 3.8 Flash rates higher on LMArena’s text leaderboard: 1498 against 1480. Gemini 3.8 Flash is cheaper: $0.82 / $4.13 per million input / output tokens, against $2 / $12 for Gemini 3.1 Pro Preview. On the 11 Vals AI benchmarks both have taken, Gemini 3.8 Flash wins 8 and Gemini 3.1 Pro Preview wins 3 (Gemini 3.8 Flash: Terminal-Bench 4.0, SWE-bench, Vibe Code Bench).
Which is cheaper, Gemini 3.8 Flash or Gemini 3.1 Pro Preview?
Gemini 3.8 Flash is cheaper: $0.82 / $4.13 per million input / output tokens, against $2 / $12 for Gemini 3.1 Pro Preview.