Claude Fable 5 vs Gemini 3.5 Flash vs Grok 4.20 beta 0309 Reasoning
Claude Fable 5 vs Gemini 3.5 Flash vs Grok 4.20 beta 0309 Reasoning: Grok 4.20 beta 0309 Reasoning is the cheapest by 87%. Claude Fable 5 (Azure AI Foundry, 1,000,000 ctx); Gemini 3.5 Flash (Google AI, 1,048,576 ctx); Grok 4.20 beta 0309 Reasoning (xAI, 2,000,000 ctx). Route any of them via Agent Command Center for shadow A/B without code changes.
| Claude Fable 5 | Gemini 3.5 Flash | Grok 4.20 beta 0309 Reasoning | |
|---|---|---|---|
| Input price | $10.00/M | $1.50/M | $2.00/M |
| Output price | $50.00/M | $9.00/M | $6.00/M |
| Context window | 1,000,000 | 1,048,576 | 2,000,000 |
| Max output | 128,000 | 65,535 | 2,000,000 |
| Function calling | ✓ | ✓ | ✓ |
| Vision | ✓ | ✓ | ✓ |
| Audio input | — | ✓ | — |
| Reasoning | ✓ | ✓ | ✓ |
| Prompt caching | ✓ | ✓ | ✓ |
| Structured output | ✓ | ✓ | — |
| Pricing verified | Aug 6, 2026 | Aug 6, 2026 | Aug 6, 2026 |
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