Claude Fable 5 vs Gemini 3.1 Pro Preview
Compare Claude Fable 5 and Gemini 3.1 Pro Preview on the metrics that decide an agent workload.
| Metric | Claude Fable 5 | Gemini 3.1 Pro Preview |
|---|---|---|
| Provider | Anthropic | Google Gemini |
| Input / 1M | $10.00 | $2.00 |
| Output / 1M | $50.00 | $12.00 |
| Cache read / 1M | $1.00 (−90%) | $0.20 (−90%) |
| Reuse-adj @55% | $16.29 | $3.76 |
| Context | 1M | 1M |
| Cache capture | 93% | 82% |
| Warm TTFT | 280ms (−70%) | 360ms (−56%) |
| Quality index | 98 | 94 |
Teal marks the better value in each row. Reuse-adjusted assumes 55% prefix reuse and a 25% output share.
Pick Claude Fable 5 when it scores higher on the composite quality index, it answers faster on warm cache hits, it captures more of the available reuse.
Pick Gemini 3.1 Pro Preview when it is cheaper once prefix reuse is priced in, it carries the larger 1M context window.
Claude Fable 5 leads on quality while Gemini 3.1 Pro Preview leads on reuse-adjusted cost. Send latency- and budget-sensitive volume to Gemini 3.1 Pro Preview and reserve Claude Fable 5 for the hard requests. Zumik's aliases route between them automatically under policy.
Claude Fable 5 vs Gemini 3.1 Pro Preview, answered.
Is Claude Fable 5 or Gemini 3.1 Pro Preview cheaper?
At 55% prefix reuse, Claude Fable 5 blends to about $16.29 per 1M tokens and Gemini 3.1 Pro Preview to about $3.76. Gemini 3.1 Pro Preview is cheaper on that basis.
Which has the larger context window?
Gemini 3.1 Pro Preview has the larger window: 1M vs 1M tokens.
Which captures more reuse?
Claude Fable 5 shows higher measured cache capture (93% vs 82%) in the Zumik corpus.
Let an alias pick for you.
Route to whichever model wins under current policy automatically. Zumik resolves the alias to the best fit per request, so you never hard-code a loser.