Claude Fable 5.1 (batch) Paid vs PEPerceptron Mk1.5 Paid
Claude Fable 5.1 (batch) vs Perceptron Mk1.5 compared — price per token, context window, multimodality, openness and which to choose. Full 2026 breakdown.
Claude Fable 5.1 (batch) — full profile › · Perceptron Mk1.5 — full profile ›
Prices & specs refreshed from live data · olud.ai
Open-model prices = cheapest provider via OpenRouter; official maker rates may be higher.
$25 /M outputManaged API (no infra to run)
$1.5 /M outputManaged API (no infra to run)
Claude Fable 5.1 (batch) vs Perceptron Mk1.5 specs
| Spec | Claude Fable 5.1 (batch) | Perceptron Mk1.5 | Winner |
|---|---|---|---|
| Maker | Anthropic | Perceptron | – |
| Type | Proprietary | Proprietary | – |
| Context window | 1M tokens | 37K tokens | |
| Input price | $5/M | $0.15/M | PEPerceptron Mk1.5 |
| Output price | $25/M | $1.5/M | PEPerceptron Mk1.5 |
| Vision / multimodal | Yes | Yes | = Tie |
| Tool / function calling | Yes | Yes | = Tie |
| Self-hostable | No (API only) | No (API only) | – |
| License | Proprietary | Proprietary | – |
Price gap & when to choose each
Perceptron Mk1.5 is ~17× cheaper than Claude Fable 5.1 (batch) on output tokens ($1.5 vs $25 per M tokens).
- You want frontier performance through a managed API
- You need the longer 1M context window
- You value reliability & ecosystem
- You don't want to manage infrastructure
- You want frontier performance through a managed API
- You want the lower output price
- You value reliability & ecosystem
- You don't want to manage infrastructure
Feature comparison
| Capability | Claude Fable 5.1 (batch) | Perceptron Mk1.5 |
|---|---|---|
| Open weights (downloadable) | ✗ | ✗ |
| Self-hostable | ✗ | ✗ |
| Runs fully offline | ✗ | ✗ |
| Vision / multimodal | ✓ | ✓ |
| Tool / function calling | ✓ | ✓ |
| 1M+ context window | ✓ | ✗ |
Benchmarks: Claude Fable 5.1 (batch) vs Perceptron Mk1.5
Independent benchmark scores measured by Artificial Analysis. Higher is better (except latency).
Benchmark data by Artificial Analysis.
How Claude Fable 5.1 (batch) and Perceptron Mk1.5 score
| Criterion | Claude Fable 5.1 (batch) | Perceptron Mk1.5 |
|---|---|---|
| Cost-efficiency | 3.0 | 4.5 |
| Context window | 5.0 | 2.5 |
| Openness | 1.5 | 1.5 |
| Self-hosting | 1.0 | 1.0 |
| Multimodality | 5.0 | 5.0 |
Scores come from live data — output price (cost), context length, open vs closed weights (openness & self-hosting) and vision/tool support (multimodality). Raw task quality isn't scored here; it depends on your benchmark — see the verdict.
What each model is
Claude Fable 5.1 (batch) Paid
Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors, front-end and visual...
Perceptron Mk1.5 Paid
Perceptron Mk1.5 is Perceptron's embodied reasoning model for physical agents. It accepts text, image, video, and audio input, and answers with text plus optional structured annotations: points, boxes, polygons, tracks,...
Frequently asked questions
Claude Fable 5.1 (batch) vs Perceptron Mk1.5 — which is cheaper?
Perceptron Mk1.5 is cheaper on output ($1.5/M vs $25/M).
Which has the larger context window?
Claude Fable 5.1 (batch) offers the larger context window (1M tokens).
Claude Fable 5.1 (batch) vs Perceptron Mk1.5 — which should I pick in 2026?
Choose Perceptron Mk1.5 for the lower output price ($1.5/M vs $25/M). Choose Claude Fable 5.1 (batch) if you need the larger 1M context window.
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