Claude Fable 5 vs GPT-5
Pricing, benchmarks, and use case comparison
Quick take
- •Claude Fable 5 leads on 1 of 1 shared benchmarks, including SWE-bench Verified (95.0% vs 74.9%).
- •Claude Fable 5 is meaningfully stronger at long context (95 vs 80 on our capability index).
- •GPT-5 is meaningfully stronger at cost efficiency (88 vs 55).
- •GPT-5 is 88% cheaper on input tokens, which compounds fast on high-volume or agentic workloads.
- •Claude Fable 5 has a 1M context window vs 400,000 tokens (128,000 max output) - better for whole-repo or long-document work.
Specs comparison
| Claude Fable 5 | GPT-5 | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Type | Closed source | Closed source |
| Context window | ✓1M | 400,000 tokens (128,000 max output) |
| Input / 1M tokens | $10.00 | ✓$1.25 |
| Output / 1M tokens | $50.00 | $10.00 |
| Release date | 2026-06 | 2025-08 |
Benchmarks
| Benchmark | Claude Fable 5 | GPT-5 |
|---|---|---|
| SWE-bench Verified | ✓95.0% | 74.9% |
| Terminal-Bench 2.1 | 88.0% | - |
| GPQA Diamond | 92.6% | - |
| SWE-bench Pro | 80.3% | - |
| AIME 2025 | - | 94.6% |
| GPQA (GPT-5 pro) | - | 88.4% |
Scores sourced from official provider release posts and independent benchmark aggregators.
Which should you choose?
Choose Claude Fable 5 if...
- →You need the absolute highest capability Anthropic offers for hard tasks
- →You run long, complex autonomous agents where quality compounds over many steps
- →You do frontier-level engineering, research, or analytics and cost is secondary
- →You want maximum accuracy on the toughest coding and reasoning benchmarks
Choose GPT-5 if...
- →You want strong reasoning at the lowest frontier-model price
- →Existing GPT-5-based systems that are already tuned and validated
- →General coding, math, and reasoning workloads on a budget