Claude Fable 5 vs Claude Opus 4.8 — Side-by-side pricing
Side-by-side API pricing and tokenizer details for Claude Fable 5 (Anthropic) and Claude Opus 4.8 (Anthropic).
Side-by-side pricing
| Feature | Claude Fable 5 | Claude Opus 4.8 |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Input (per 1M tokens) | $10.00 | $5.00 |
| Output (per 1M tokens) | $50.00 | $25.00 |
| Context caching | Yes — 90% off cached tokens | Yes — 90% off cached tokens |
| Batch API discount | 50% off | 50% off |
| Context window | 1M tokens | 1M tokens |
| Tokenizer | Anthropic tokenizer (Opus 4.7+) | Anthropic tokenizer (Opus 4.7+) |
Real-world cost example
1,000 API requests per month, each with 500 input tokens and 200 output tokens (500K input + 200K output total).
Claude Fable 5
$15.0000
Input: $5.0000 +Output: $10.0000
Claude Opus 4.8
$7.5000
Input: $2.5000 +Output: $5.0000
Claude Opus 4.8 is 50% cheaper for this workload — saving $7.5000 per month at this volume.
Frequently asked questions
No, Claude Opus 4.8 is cheaper for the typical workload above. At $5.00/1M input and $25.00/1M output tokens, it costs $7.5000 versus $15.0000 for Claude Fable 5 — a 50% difference.
Claude Fable 5 supports a 1M token context window. Claude Opus 4.8 supports a 1M token context window. A larger context window lets you include more text — documents, conversation history, or code — in a single API call.
Claude Fable 5 supports context caching (90% off repeated tokens). It offers a 50% Batch API discount. Claude Opus 4.8 supports context caching (90% off repeated tokens). It offers a 50% Batch API discount.
Yes, both Claude Fable 5 and Claude Opus 4.8 use the Anthropic tokenizer (Opus 4.7+). The same text produces identical token counts on both models, so any cost difference is purely due to the rate each provider charges per token.
Claude Fable 5 (Anthropic): $10 input / $50 output per 1M tokens. Claude Opus 4.8 (Anthropic): $5 input / $25 output per 1M tokens. Rates shown before caching or batch discounts.
For an 80% output / 20% input workload — typical for code generation or long-form writing — Claude Fable 5 costs $42.0000 per 1M total tokens and Claude Opus 4.8 costs $21.0000. Claude Opus 4.8 is 50% cheaper for this pattern. For your exact ratio, paste a real prompt into the calculator above.
Claude Fable 5 has a 1M-token context window — approximately 750K words or ~3K pages of standard text. Claude Opus 4.8 has a 1M-token context window — approximately 750K words or ~3K pages. (Estimates assume ~0.75 words per token.)
Calculate costs for your actual prompt
Paste your prompt into the calculator and get exact token counts using each model's real tokenizer — all in your browser.
Open calculator