Claude Fable 5 vs Claude Sonnet 4
Pricing verdict: Claude Fable 5 vs Claude Sonnet 4: Claude Sonnet 4 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 Claude Sonnet 4 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
Claude Sonnet 4
Cost Differences
Claude Sonnet 4 costs less than Claude Fable 5
Quick Recommendation
Winner for direct API pricing: Claude Sonnet 4. At the default workload, Claude Sonnet 4 saves about $73.50/month ($894.25/year) versus Claude Fable 5.
Feature Comparison
| Feature | Claude Fable 5 | Claude Sonnet 4 |
|---|---|---|
| Provider | Anthropic | Anthropic |
| 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 | 200,000 tokens |
| Max Output | 128,000 tokens | 64,000 tokens |
| Category | flagship | standard |
| Capabilities | textvisionreasoningcode | textvisioncodereasoning |
| Release Date | 6/9/2026 | 5/14/2025 |
Claude Fable 5 vs Claude Sonnet 4: Which Should You Choose?
Choosing between Claude Fable 5 and Claude Sonnet 4 depends on your priorities: cost efficiency, context length, or raw capability. Claude Sonnet 4 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 200,000 for Claude Sonnet 4.
These models target different tiers: Claude Fable 5 is a flagship model while Claude Sonnet 4 is standard. This means they're optimized for different workloads. Claude Fable 5 is built for complex tasks that require deeper reasoning, while Claude Sonnet 4 offers better value for routine operations.
Output costs matter too. Claude Fable 5 charges $50.00/1M output tokens vs $15.00 for Claude Sonnet 4. For generation-heavy workloads (content creation, code generation, summarization), output pricing often dominates your bill. Claude Sonnet 4 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 need longer outputs (up to 128,000 tokens)
- • You're already using Anthropic's API ecosystem
Choose Claude Sonnet 4 when:
- • Budget is a primary concern
- • You're already using Anthropic'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 Claude Sonnet 4
- • Higher output cost than Claude Sonnet 4
Claude Sonnet 4
- • Input pricing: $3.00/M tokens
- • Output pricing: $15.00/M tokens
- • Context window: 200,000 tokens
- • Max output: 64,000 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)
Claude Sonnet 4 (Anthropic)
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Sign Up for Anthropic →Frequently Asked Questions
Which is cheaper, Claude Fable 5 or Claude Sonnet 4?▼
What is the context window difference between Claude Fable 5 and Claude Sonnet 4?▼
Which model is better for AI Agent / Agentic Workflows?▼
Which model has better overall pricing for heavy usage?▼
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