Claude Fable 5 vs Gemini 3.8 Flash
Different efforts: max · medium · Compare all at high
Arena Text · creative writing Arena Text · creative writing: Human pairwise preferences in the stated text vote pool
Fable 5 · high1,501
Gemini 3.8 Flash · high1,487
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
Fable 583
Gemini 3.8 Flash76.8
EQ-Bench Creative Writing v3 Creative Writing v3 · Elo: Judge-rated creative writing under the v3 prompt set and pairwise ranking
Fable 51,943.1
Gemini 3.8 Flash1,747.9
Lech Mazur Short-Story Lech Mazur Short-Story · comparison score: Judges compare stories written to ten required elements; the comparison score can be negative
Fable 5 · high2.9
Gemini 3.8 Flash · high0.1
IFBench (instructions) IFBench (instructions): Checks whether the model follows precise formatting and content instructions
Fable 563.5
Gemini 3.8 Flash—
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
Fable 5—
Gemini 3.8 Flash · high0
| Benchmark | Fable 5 | Gemini 3.8 Flash |
|---|---|---|
| Arena Text · creative writing | 1,501 · high | 1,487 · high |
| EQ-Bench Longform Creative Writing 1.11 | 83 | 76.8 |
| EQ-Bench Creative Writing v3 | 1,943.1 | 1,747.9 |
| Lech Mazur Short-Story | 2.9 · high | 0.1 · high |
| IFBench (instructions) | 63.5 | — |
| Harvey LAB-AA 1.1 | — | 0 · high |
Specs
| Spec | Fable 5 | Gemini 3.8 Flash |
|---|---|---|
| Input, per 1M | $10 | !$0.75 |
| Output, per 1M | $50 | !$3.75 |
| Cost per task? | $8.75 | $0.93 |
| Speed, tok/s | 67 | — |
| Context | 1M | 1M |
| Weights | Closed | Closed |
| Released | Jun 2026 | Sep 2026 |
| See images | ✓ | ✓ |
| Read PDFs | Partial | ✓ |
| Hear audio | — | ✓ |
| Watch video | — | ✓ |
| Call tools | ✓ | ✓ |
| Force a tool call | Partial | Partial |
| Return strict JSON | ✓ | ✓ |
| Search the web | ? | ✓ |
| Run code | ? | ✓ |
| Use a computer | ? | ? |
What breaks when you switch
Fable 5 → Gemini 3.8 Flash
Sampling parameters are ignored›
temperature, top_p and top_k are ignored now and will cause HTTP 400 in future generations; remove them from requests.
No minimal thinking level›
The minimal thinking level returns an error; avoid minimal.
Gemini 3.8 Flash → Fable 5
Nothing known.