Claude Fable 5 vs Grok 3
Pricing verdict: Claude Fable 5 vs Grok 3: Grok 3 is cheaper for input-heavy usage ($3.00/M vs $10.00/M input tokens), while Claude Fable 5 is better for long-context tasks (1,000,000 tokens).
Direct answer: choose Grok 3 for lower token spend and choose Claude Fable 5 when your workload needs longer context.
Compare API pricing, input and output token costs, context windows, and monthly estimates on one page so you can pick the right model fast.
Cost Comparison (1000 input + 500 output tokens, 100 requests/day)
Claude Fable 5
Grok 3
Cost Differences
Grok 3 costs less than Claude Fable 5
Quick Recommendation
Winner for direct API pricing: Grok 3. At the default workload, Grok 3 saves about $73.50/month ($894.25/year) versus Claude Fable 5.
Feature Comparison
| Feature | Claude Fable 5 | Grok 3 |
|---|---|---|
| Provider | Anthropic | xAI |
| Input Price | $10.00/1M tokens | $3.00/1M tokens |
| Output Price | $50.00/1M tokens | $15.00/1M tokens |
| Context Window | 1,000,000 tokens | 131,072 tokens |
| Max Output | 128,000 tokens | 131,072 tokens |
| Category | flagship | flagship |
| Capabilities | textvisionreasoningcode | textvisionreasoningcode |
| Release Date | 6/9/2026 | 2/17/2025 |
Claude Fable 5 vs Grok 3: Which Should You Choose?
Choosing between Claude Fable 5 and Grok 3 depends on your priorities: cost efficiency, context length, or raw capability. Grok 3 is the more affordable option at $3.00/1M input tokens — 70% cheaper than Claude Fable 5. Meanwhile, Claude Fable 5 offers a significantly larger context window at 1,000,000 tokens vs 131,072 for Grok 3.
These models come from different providers — Anthropic and xAI — which means different API ecosystems, SDKs, rate limits, and terms of service. If you're already integrated with Anthropic, switching to xAIinvolves migration effort beyond just pricing. Factor in your existing infrastructure when deciding.
Both models are in the flagship category, making this a direct head-to-head comparison. At scale — say 10,000 requests per day — the cost difference adds up: Grok 3 would save you roughly $7,350.00/month compared to Claude Fable 5. For startups and indie developers, that difference can be significant.
Output costs matter too. Claude Fable 5 charges $50.00/1M output tokens vs $15.00 for Grok 3. For generation-heavy workloads (content creation, code generation, summarization), output pricing often dominates your bill. Grok 3 has the edge here at $15.00/1M output tokens.
Multimodal capabilities: Both models support vision (image understanding), so you can send images alongside text prompts with either option.
Best Use Cases
Choose Claude Fable 5 when:
- • You need a larger context window (1,000,000 tokens)
- • You're already using Anthropic's API ecosystem
Choose Grok 3 when:
- • Budget is a primary concern
- • You need longer outputs (up to 131,072 tokens)
- • You're already using xAI's API ecosystem
Pros and Caveats at a Glance
Claude Fable 5
- • Input pricing: $10.00/M tokens
- • Output pricing: $50.00/M tokens
- • Context window: 1,000,000 tokens
- • Max output: 128,000 tokens
Watch out for
- • Higher input cost than Grok 3
- • Higher output cost than Grok 3
Grok 3
- • Input pricing: $3.00/M tokens
- • Output pricing: $15.00/M tokens
- • Context window: 131,072 tokens
- • Max output: 131,072 tokens
Watch out for
- • Smaller context window than Claude Fable 5
Try Different Scenarios
Use the calculator below to see how costs change with different usage patterns
Claude Fable 5 (Anthropic)
Grok 3 (xAI)
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Which is cheaper, Claude Fable 5 or Grok 3?▼
What is the context window difference between Claude Fable 5 and Grok 3?▼
Which model is better for AI Agent / Agentic Workflows?▼
Which model has better overall pricing for heavy usage?▼
Where can I compare Anthropic and xAI API pricing beyond this model matchup?▼
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