Claude Fable 5 vs o3
Anthropic vs OpenAI · Prices checked 12 August 2026
On price o3 edges it, $19.00 per million tokens blended versus $22.00, about 14 per cent less. A single 100K-input, 10K-output job costs $1.40 on o3 against $1.50 on Claude Fable 5.
Capability favours Claude Fable 5, ahead on 4 of 6 suites they both publish. The widest gap is on SWE-bench Verified, where Claude Fable 5 leads by 20 points. 2 suites tied. Claude Fable 5 reads more in one request: 1,000,000 tokens of context against 200,000.
Pricing and capacity
| Metric | Claude Fable 5 | o3 | Difference |
|---|---|---|---|
| Input / 1M tokens | $10.00 | $10.00 | level |
| Output / 1M tokens | $50.00 | $40.00 | 20% |
| Blended · 70/30calculated | $22.00 | $19.00 | 14% |
| Blended · 50/50calculated | $30.00 | $25.00 | 17% |
| Blended · 80/20calculated | $18.00 | $16.00 | 11% |
| Blended · 20/80calculated | $42.00 | $34.00 | 19% |
| Job cost · 100K + 10Kcalculated | $1.50 | $1.40 | 7% |
| Job cost · 1M + 100Kcalculated | $15.00 | $14.00 | 7% |
| Context window | 1,000,000 | 200,000 | 5.0× |
Input and output rates are as published by each provider. Blended and job-cost rows are calculated comparison metrics, not published prices — how they are derived.
Benchmarks
| Benchmark | Claude Fable 5 | o3 | Leader |
|---|---|---|---|
| MMLU | 90% | 90% | Level |
| GPQA Diamond | 95% | 88% | Claude Fable 5 |
| MATH | 96% | 96% | Level |
| HumanEval | 96% | 95% | Claude Fable 5 |
| SWE-bench Verified | 91% | 71% | Claude Fable 5 |
| LMArena Elo | 1392 Elo | 1380 Elo | Claude Fable 5 |
Only suites both models report are listed, so a missing score is never shown as a loss. Figures are provider-published or from public leaderboards and are not independently re-run.
What each model is for
Claude Fable 5
Anthropic · Frontier
Anthropic's most powerful model, a new tier above Opus. Fable 5 keeps the 1M-token context window and multimodal input (text, image, file), and targets the hardest long-horizon agentic, coding and reasoning work. Priced at $10/$50 per MTok with $1.00 cached input.
- Most capable Claude to date
- State-of-the-art long-horizon agentic execution
- 1M-token context
- Text, image & file input
Frequently asked questions
Which is cheaper, Claude Fable 5 or o3?
On price o3 edges it, $19.00 per million tokens blended versus $22.00, about 14 per cent less. A single 100K-input, 10K-output job costs $1.40 on o3 against $1.50 on Claude Fable 5. Blended cost weights input at 70% and output at 30%; price your own token split for an exact answer, since the cheaper model on a blended basis is not always cheaper for your workload.
Which performs better, Claude Fable 5 or o3?
Capability favours Claude Fable 5, ahead on 4 of 6 suites they both publish. The widest gap is on SWE-bench Verified, where Claude Fable 5 leads by 20 points. 2 suites tied. These are the figures each provider or public leaderboard publishes, not results we re-run, and a benchmark average can hide the specific behaviour your workload depends on.
Which has the larger context window, Claude Fable 5 or o3?
Claude Fable 5 reads more in one request: 1,000,000 tokens of context against 200,000. The context window caps everything in a single request: prompt, retrieved documents, conversation history and the model’s own output all share it.
Can I compare Claude Fable 5 and o3 on my own numbers?
Yes. Open both in the side-by-side comparison tool to see every field at once, or use the token calculator to price your actual prompt and monthly request volume against each model. Both are free and need no sign-up.
Price it for your own workload
Related matchups
Terms used on this page
Prices and scores are recomputed on every deploy from the catalogue. Prices checked 12 August 2026.