Claude Fable 5 Paid vs 
Grok 4.5 Paid
Claude Fable 5 vs Grok 4.5 compared — price per token, context window, multimodality, openness and which to choose. Full 2026 breakdown.
Claude Fable 5 — full profile › · Grok 4.5 — full profile ›
Prices & specs refreshed from live data · OpenSourceAI.tech
Open-model prices = cheapest provider via OpenRouter; official maker rates may be higher.
Claude Fable 5 vs Grok 4.5 specs
| Spec | Claude Fable 5 | Grok 4.5 |
|---|---|---|
| Maker | Anthropic | xAI |
| Type | Proprietary | Proprietary |
| Context window | 1M tokens | 500K tokens |
| Input price | $10/M | $2/M |
| Output price | $50/M | $6/M |
| Vision / multimodal | Yes | Yes |
| Tool / function calling | Yes | Yes |
| Self-hostable | No (API only) | No (API only) |
| License | Proprietary | Proprietary |
Feature comparison
| Capability | Claude Fable 5 | Grok 4.5 |
|---|---|---|
| Open weights (downloadable) | ✗ | ✗ |
| Self-hostable | ✗ | ✗ |
| Runs fully offline | ✗ | ✗ |
| Vision / multimodal | ✓ | ✓ |
| Tool / function calling | ✓ | ✓ |
| 1M+ context window | ✓ | ✗ |
Benchmarks: Claude Fable 5 vs Grok 4.5
Independent benchmark scores measured by Artificial Analysis. Higher is better (except latency).
Benchmark data by Artificial Analysis.
How Claude Fable 5 and Grok 4.5 score
| Criterion | Claude Fable 5 | Grok 4.5 |
|---|---|---|
| Cost-efficiency | 2.0 | 4.0 |
| Context window | 5.0 | 4.5 |
| 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 Paid
Claude Fable 5 is a Mythos-class model from Anthropic, built for autonomous knowledge work and coding. It supports text, image, and file inputs with text output, with reasoning support and...
Grok 4.5 Paid
Grok 4.5 is SpaceXAI's smartest model with frontier performance on coding, knowledge work, and STEM.
Other models in these families
These variants are tracked but not compared here — one page per family keeps the comparison readable.
Frequently asked questions
Claude Fable 5 vs Grok 4.5 — which is cheaper?
Grok 4.5 is cheaper on output ($6/M vs $50/M).
Which has the larger context window?
Claude Fable 5 offers the larger context window (1M tokens).
Claude Fable 5 vs Grok 4.5 — which should I pick in 2026?
Choose Grok 4.5 for the lower output price ($6/M vs $50/M). Choose Claude Fable 5 if you need the larger 1M context window.
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