Aion 3.0 vs Claude Fable 5.1
aion-labs/aion-3-0 · anthropic/claude-fable-5.1
As of November 4, 2026, Aion 3.0 is the cheaper API on UberLLM: $1.05 per million input tokens and $2.10 per million output, versus $0.6751 / $3.38 for Claude Fable 5.1, about 32% less when output is 3 tokens for every input token. These are the best prices on the market right now. Both work with one OpenAI-compatible key and UberLLM adds no fee. Choose Aion 3.0 to cut cost; choose Claude Fable 5.1 when context size wins. Claude Fable 5.1 carries the larger context window (1,000,000 vs 128,000 tokens), which can matter for long-document work.
Aion 3.0 vs Claude Fable 5.1, side by side
| Spec | Aion 3.0 | Claude Fable 5.1 |
|---|---|---|
| Price · input / 1M | $1.05 | $0.6751 |
| Price · output / 1M | $2.10 | $3.38 |
| Context length | 128,000 | 1,000,000 |
| Max output tokens | 32,768 | 128,000 |
| Input modalities | text | text, image, file |
| Output modalities | text | text |
| Tools / functions | Yes | Yes |
| Vision (image input) | — | Yes |
| Reasoning | Yes | Yes |
| % off list | 65% off | 93.3% off |
Best prices on UberLLM right now. No UberLLM fee on requests; adding credit by card costs 5.5% + $0.50. Updated November 4, 2026. A price more than 70% below list is what buyers were billed, not an error. Why so cheap?
Aion 3.0 vs Claude Fable 5.1 — FAQ
Is Aion 3.0 or Claude Fable 5.1 cheaper?
Aion 3.0 is cheaper on a blended token mix, by about 32%. A request costs what its provider charged, UberLLM adds no fee, and every request is listed with its cost in Activity.
What's the price difference between Aion 3.0 and Claude Fable 5.1?
Aion 3.0: $1.05 in / $2.10 out per 1M tokens. Claude Fable 5.1: $0.6751 in / $3.38 out per 1M tokens. That's roughly a 32% blended difference. Prices are live; UberLLM adds no fee.
Can I use both Aion 3.0 and Claude Fable 5.1 with one API?
Yes. Both are served through a single OpenAI-compatible endpoint — set the base URL to https://api.uberllm.dev/v1 and your UberLLM key, then switch between them by changing the model id. Anthropic SDKs work via https://api.uberllm.dev/v1/messages.