Head-to-Head Model Pricing & Benchmark Breakdown
Claude Opus 5 vs Claude Fable 5: Frontier Flagship vs Deep Reasoning
Anthropic’s 1M context synthesis master against its specialized reasoning engine.
Adjust Your Custom Token Workload
Monthly Requests25k
Input Tokens / Req8000
Output Tokens / Req1500
Prompt Cache %60%
Claude Opus 5 is 50.0% More Cost-Effective
Saves $1,397.50 per month ($16,770.00/yr) at this volume.
Annualized Savings$16,770.00
Anthropic
Most EconomicalClaude Opus 5
Total Monthly Cost
$1,397.50 / month
$55.90 per 1,000 requestsInput Tokens / 1M:$5.00
Cached Input / 1M:$0.500
Output Tokens / 1M:$25.00
Context Window:1M
Inference Speed:~60 TPS
Anthropic
Claude Fable 5
Total Monthly Cost
$2,795.00 / month
$111.80 per 1,000 requestsInput Tokens / 1M:$10.00
Cached Input / 1M:$1.000
Output Tokens / 1M:$50.00
Context Window:1M
Inference Speed:~50 TPS
The Verdict: Which Model Wins on Cost & ROI?
Claude Opus 5 is 50% cheaper ($5.00/$25.00 vs $10.00/$50.00) and excels at massive document synthesis and nuanced creative writing, while Claude Fable 5 is purpose-built for formal mathematical proofs and theorem verification.
Key Architectural & Economic Differences
- Claude Opus 5 is 50% cheaper across input and output tokens.
- Both feature 1,000,000 token context windows with 90% prompt caching discounts.
- Claude Fable 5 scores an industry-high 99.1% on competitive mathematics benchmarks.
- Claude Opus 5 is faster (~60 TPS vs ~50 TPS) for general text generation.
When to Choose Claude Opus 5
- • Large corpus document synthesis, legal brief drafting, executive summaries
When to Choose Claude Fable 5
- • Formal mathematical verification, competitive coding, rigorous STEM proofs
Detailed Spec & Pricing Comparison Table
| Specification / Metric | Claude Opus 5 (Anthropic) | Claude Fable 5 (Anthropic) | Advantage |
|---|---|---|---|
| Input Price / 1M Tokens | $5.00 | $10.00 | Claude Opus 5 |
| Cached Input Price / 1M | $0.500 (90%) | $1.000 (90%) | Claude Opus 5 |
| Output Price / 1M Tokens | $25.00 | $50.00 | Claude Opus 5 |
| Context Window | 1M | 1M | Tie |
| Inference Speed (Tokens/Sec) | ~60 TPS | ~50 TPS | Claude Opus 5 |
| MMLU Benchmark Score | 95.2% | 96.5% | Claude Fable 5 |
Frequently Asked Questions
Choose Claude Fable 5 when solving complex algorithmic problems or rigorous mathematical proofs where step-by-step verification is required. For all general writing and document digestion, Claude Opus 5 provides superior ROI.
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