Claude Fable 5 vs Gemini 3.8 Flash: Specs & Benchmark Comparison
| Characteristic | Claude Fable 5 | Gemini 3.8 Flash |
|---|---|---|
| Company | Anthropic | |
| Release Date | June 9, 2026 | September 2, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | 1.0M |
| Context (output) | 128K | 66K |
| Input Price / 1M | $10.00 | $0.75 |
| Output Price / 1M | $50.00 | $3.75 |
| Average Score | 0.6 | 0.6 |
| Benchmarks | ||
| BioMysteryBench | 0.5 | 0.6 |
| GDP.pdf | 0.3 | 0.3 |
| Terminal-Bench 2.1 | 0.8 | 0.9 |
| DeepSWE 1.1 | 0.7 | 0.7 |
Visual Benchmark Comparison
Claude Fable 5
Gemini 3.8 Flash
BioMysteryBench0.5 vs 0.6
0.5
0.6
GDP.pdf0.3 vs 0.3
0.3
0.3
Terminal-Bench 2.10.8 vs 0.9
0.8
0.9
DeepSWE 1.10.7 vs 0.7
0.7
0.7
Verdict
Gemini 3.8 Flash leads in 3 out of 4 comparison categories.
Overall Performance
Both models show comparable average scores: Claude Fable 5 — 0.6, Gemini 3.8 Flash — 0.6.
API Cost
Gemini 3.8 Flash is 13.3x cheaper: input $0.75/1M vs $10.00/1M tokens.
Context Window
Gemini 3.8 Flash supports a larger context: 1M vs 1M tokens.
Recency
Gemini 3.8 Flash is newer: released 9/2/2026 vs 6/9/2026.
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Frequently Asked Questions
Which is better for coding — Claude Fable 5 or Gemini 3.8 Flash?
Direct comparison on the SWE-Bench benchmark is not available. We recommend reviewing other metrics on the comparison page.
Which model is cheaper — Claude Fable 5 or Gemini 3.8 Flash?
Gemini 3.8 Flash is cheaper for input: $0.75 per 1M tokens vs $10.00.
Which has a larger context window — Claude Fable 5 or Gemini 3.8 Flash?
Gemini 3.8 Flash supports a larger context: 1,048,576 tokens vs 1,000,000.
The Claude Fable 5 and Gemini 3.8 Flash comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Claude Fable 5 or Gemini 3.8 Flash page. See also the complete list of AI model comparisons.