Model comparison
Holo4 27B vs Claude Fable 5.1
- Input
- $0.40
- Output
- $3.00
- Context
- 262,144 tokens (256K)
- Released
- 2026-09-28
- Input
- $10.00
- Output
- $50.00
- Context
- 1M
- Released
- 2026-09-01
Holo4 27B and Claude Fable 5.1 split the 2 benchmarks both report evenly; Holo4 27B is cheaper on input tokens ($0.4 vs $10 per 1M, 25×); Claude Fable 5.1 has the larger context window (1M vs 262K); Holo4 27B ships open weights while Claude Fable 5.1 is API-only.
Specs and pricing side by side
| Spec | Holo4 27B | Claude Fable 5.1 |
|---|---|---|
| Maker | H Company | Anthropic |
| Released | 2026-09-28 | 2026-09-01 |
| Context window | 262,144 tokens (256K) | 1M |
| Max output | not published | 128K |
| Input price | $0.40 | $10.00 |
| Output price | $3.00 | $50.00 |
| Parameters | 27B (dense) | Undisclosed |
| License | CC-BY-NC-4.0 | Proprietary |
| Weights | Open weights | API only |
| Modalities | Text, Vision | Text, Visionsame |
Not published by either maker: knowledge cutoff.
Benchmarks both models report
| Benchmark | Holo4 27B | Claude Fable 5.1 |
|---|---|---|
| OSWorld 2.0 | 61.7% | 77.9% |
| AutomationBench | 45.4% | 31.4% |
Scores are as published by each maker or its cited source; harness, reasoning effort and date can differ between rows, so treat small gaps as ties. Sources are listed on each model page.
Which one should you pick?
Pick Holo4 27B if…
- You care about AutomationBench (it scores higher on 1 shared benchmark).
- Cost matters: input tokens cost 25× less ($0.4 vs $10 per 1M).
- You want to self-host or fine-tune (open weights, CC-BY-NC-4.0).
- Your use case is: reach for it for computer-use agents that operate desktop software, websites and Android apps through screenshots and clicks.
Pick Claude Fable 5.1 if…
- You care about OSWorld 2.0 (it scores higher on 1 shared benchmark).
- You need the longer context (1M vs 262K).
- Your use case is: run long-horizon agentic coding across large codebases where Claude Opus 5 at higher effort still falls short on your evals.
FAQ
Which is better, Holo4 27B or Claude Fable 5.1?
Holo4 27B and Claude Fable 5.1 split the 2 benchmarks both report evenly; Holo4 27B is cheaper on input tokens ($0.4 vs $10 per 1M, 25×); Claude Fable 5.1 has the larger context window (1M vs 262K); Holo4 27B ships open weights while Claude Fable 5.1 is API-only. The better pick depends on whether you value benchmark scores, price per token, context length or openness for your workload.
How much cheaper is Holo4 27B?
Holo4 27B: $0.40 input, $3.00 output. Claude Fable 5.1: $10.00 input, $50.00 output (list API prices as published by each maker).
What are the context windows of Holo4 27B and Claude Fable 5.1?
Holo4 27B offers 262,144 tokens (256K); Claude Fable 5.1 offers 1M with up to 128K output.
Is Holo4 27B newer than Claude Fable 5.1?
Holo4 27B was released 2026-09-28; Claude Fable 5.1 was released 2026-09-01.