Gemini 3 Pro Preview vs Gemini 3.1 Pro Preview
Different efforts: high · thinking · Compare all at high
Arena Text · creative writing Arena Text · creative writing: Human pairwise preferences in the stated text vote pool
Gemini 3 Pro Preview1,485
Gemini 3.1 Pro Preview1,481
EQ-Bench Longform Creative Writing 1.11 Longform Creative Writing 1.11: Models plan, revise and write a story across eight turns, graded with a writing rubric
Gemini 3 Pro Preview68.8
Gemini 3.1 Pro Preview68.2
EQ-Bench Creative Writing v3 Creative Writing v3 · Elo: Judge-rated creative writing under the v3 prompt set and pairwise ranking
Gemini 3 Pro Preview1,524.5
Gemini 3.1 Pro Preview1,491.3
IFBench (instructions) IFBench (instructions): Checks whether the model follows precise formatting and content instructions
Gemini 3 Pro Preview70.4
Gemini 3.1 Pro Preview77.1
Lech Mazur Short-Story Lech Mazur Short-Story · comparison score: Judges compare stories written to ten required elements; the comparison score can be negative
Gemini 3 Pro Preview—
Gemini 3.1 Pro Preview-2.2
Harvey LAB-AA 1.1 Harvey LAB-AA 1.1: Legal agents work from case documents; every rubric criterion must pass and material hallucinations receive no credit
Gemini 3 Pro Preview—
Gemini 3.1 Pro Preview0
| Benchmark | Gemini 3 Pro Preview | Gemini 3.1 Pro Preview |
|---|---|---|
| Arena Text · creative writing | 1,485 | 1,481 |
| EQ-Bench Longform Creative Writing 1.11 | 68.8 | 68.2 |
| EQ-Bench Creative Writing v3 | 1,524.5 | 1,491.3 |
| IFBench (instructions) | 70.4 | 77.1 |
| Lech Mazur Short-Story | — | -2.2 |
| Harvey LAB-AA 1.1 | — | 0 |
Specs
| Spec | Gemini 3 Pro Preview | Gemini 3.1 Pro Preview |
|---|---|---|
| Input, per 1M | !$2 | $2 |
| Output, per 1M | !$12 | $12 |
| Cost per task? | — | $1.30 |
| Speed, tok/s | — | 115 |
| Context | 1M | 1M |
| Weights | Closed | Closed |
| Released | Nov 2025 | Feb 2026 |
| See images | ✓ | ✓ |
| Read PDFs | Partial | ✓ |
| Hear audio | ✓ | ✓ |
| Watch video | ✓ | ✓ |
| Call tools | ✓ | ✓ |
| Force a tool call | ? | Partial |
| Return strict JSON | ✓ | ✓ |
| Search the web | ? | ✓ |
| Run code | ? | ✓ |
| Use a computer | ? | ? |
What breaks when you switch
Gemini 3 Pro Preview → Gemini 3.1 Pro Preview
Cannot use both thinking controls›
Setting thinking_level and legacy thinking_budget together returns HTTP 400; use only one.
Gemini 3.1 Pro Preview → Gemini 3 Pro Preview
Cannot use both thinking controls›
Setting thinking_level and legacy thinking_budget together returns HTTP 400; use only one.