Fable 5.1 shines in benchmarks, beating rivals' top tiers at half the cost
Anthropic's Fable 5.1 has drawn significant community attention with strong results across multiple benchmarks. Data shared by several reviewers shows the model matching or even beating competitors' high-end versions while costing considerably less — seen as the latest proof that "the cost per unit of intelligence keeps falling."
Confirmed
- @haider1 shared CursorBench 3.2 data: Fable 5.1 Medium scored 68.0% at $3.53 per task, while GPT-5.6 Sol Max scored 67.2% at a higher per-task cost.
- @kimmonismus and @eyishazyer both noted that Fable 5.1 High clearly outperforms Sol 5.6 Max in Cursor Bench at a lower price, and also shows notable gains over its predecessor on Artificial Analysis benchmarks.
- @danielmac8 said Fable 5.1 Low beats Mythos 5 High on Terminal-Bench 4.0, and that its cost per unit of performance on CursorBench is lower than the previous Fable generation, with markedly better intelligence per unit of compute.
- @scaling01 and @Angaisb relayed the same core data point: Fable 5.1 scores on par with Fable 5 on the Artificial Analysis Intelligence Index while cutting per-task cost in half.
- @eyishazyer added that the model tends to be verbose.
Why it matters
- In the debate over "frontier models getting more expensive," @scaling01 and @Angaisb argue that while absolute costs are rising, cost per unit of intelligence is falling — and Fable 5.1's data strongly supports that view.
- For developers and enterprise users, Fable 5.1 delivers coding capabilities comparable to rivals' high-end versions at a lower cost, potentially reshaping model selection and cost structures.
2026-09-02 ~ 2026-09-02 · 7 related posts
- Episode 1: Fable 5.1 Tops Finance Benchmark at Higher Cost(2026-09-02, 2 posts)
- Episode 2: Fable 5.1 shines in benchmarks, beating rivals' top tiers at half the cost(2026-09-02, 7 posts)
- Episode 3: Tests show Fable 5.1 costs up to 56% more than Fable 5(2026-09-02, 6 posts)
Primary sources
- Fable 5.1 Beats GPT-5.6 on Benchmark at Lower Cost — haider1 ·
- Fable 5.1 Matches Performance of Fable 5 at Half the Cost — scaling01 ·
- Fable 5.1: Matches High-End Rivals at Lower Cost — daniel_mac8 ·
- [source] Fable 5.1 Beats GPT-5.6 on Benchmark at Lower Cost — haider1 · 2026-09-02
- Fable 5.1 leaps ahead on price-performance, beating Sol 5.6 Max on Cursor Bench for less — kimmonismus · 2026-09-02
- [source] Fable 5.1: Matches High-End Rivals at Lower Cost — daniel_mac8 · 2026-09-02
- [source] Fable 5.1 Matches Performance of Fable 5 at Half the Cost — scaling01 · 2026-09-02
- Fable 5.1 Benchmarks Show Gains Over Sol 5.6 Max — eyishazyer · 2026-09-02
- Claude Fable 5.1 tops benchmarks but costs 20% more per task due to higher token usage — ArtificialAnlys · 2026-09-02
1 near-duplicate retellings: Angaisb_