Choose AionLabs: Aion-1.0 if…
- cost matters at scale — it is 50% cheaper on a typical 3:1 input/output mix ($460 vs $875 a month for 50,000 support chats)
AionLabs: Aion-1.0 vs Anthropic: Claude Fable 5.1 (batch)
Neither wins outright: AionLabs: Aion-1.0 is the pick when cost matters at scale, Anthropic: Claude Fable 5.1 (batch) when you need to fit long inputs in one request.
Key numbers
| Spec | AionLabs: Aion-1.0 | Anthropic: Claude Fable 5.1 (batch) |
|---|---|---|
| Provider | Aion Labs | Anthropic |
| Input price (per 1M tokens) | $4.00 | $5.00 |
| Output price (per 1M tokens) | $8.00 | $25.00 |
| Blended price (3:1 input/output) | $5.00 | $10.00 |
| Cheaper than … of all models we track | 10% | 5% |
| Context window | 131K tokens (~197 pages) | 1M tokens (~1,500 pages) |
| Larger context than … of all models | 22% | 69% |
| Max output per response | 33K tokens (~24,600 words) | 128K tokens (~96,000 words) |
| Input types | text | text, image, file |
| Output types | text | text |
| Free variant | No | No |
| Listed since | 2025-02-04 | 2026-09-01 |
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What it costs for real workloads
Monthly cost at list price for five common workloads. Token counts per unit are stated so you can scale them to your own traffic. A workload that does not fit a model's context window is marked rather than priced.
| Workload (per month) | AionLabs: Aion-1.0 | Anthropic: Claude Fable 5.1 (batch) | Difference |
|---|---|---|---|
| Customer-support chatbot 50,000 conversations — each a 6-turn conversation (1,500 in / 400 out tokens) | $460 | $875 | AionLabs: Aion-1.0 saves $415 |
| RAG search over documents 20,000 questions — each a question answered from ~8 retrieved passages (6,000 in / 500 out tokens) | $560 | $850 | AionLabs: Aion-1.0 saves $290 |
| Coding / tool-using agent 2,000 tasks — each a multi-step task with tool calls and file context (60,000 in / 6,000 out tokens) | $576 | $900 | AionLabs: Aion-1.0 saves $324 |
| Batch summarisation 10,000 documents — each a 6,000-word report summarised to a page (8,000 in / 600 out tokens) | $368 | $550 | AionLabs: Aion-1.0 saves $182 |
| Long-document analysis 500 documents — each a 150-page contract or codebase read in one pass (100,000 in / 2,000 out tokens) | $208 | $275 | AionLabs: Aion-1.0 saves $67.00 |
Capabilities side by side
| Capability | AionLabs: Aion-1.0 | Anthropic: Claude Fable 5.1 (batch) | What it lets you do |
|---|---|---|---|
| Tool / function calling | — | ✓ Yes | call your APIs and run agent loops |
| Structured output (JSON schema) | — | ✓ Yes | return JSON that validates against your schema |
| Reasoning / thinking mode | ✓ Yes | ✓ Yes | spend extra tokens thinking before answering hard problems |
| Image input | — | ✓ Yes | read screenshots, charts and scanned pages |
| Audio input | — | — | take speech or audio directly |
| File / PDF input | — | ✓ Yes | accept documents without your own parsing step |
| Image output | — | — | generate images, not just text |
| Built-in web search | — | ✓ Yes | answer from live web results |
| Seed (reproducible sampling) | — | — | repeat a generation for tests and evals |
| Log-probabilities | — | — | read token confidence for classification and scoring |
From each model's published parameters and input/output types. “—” means not advertised, not proven absent.
Price history
- AionLabs: Aion-1.0: price unchanged since we started tracking it on 2026-03-10.
- Anthropic: Claude Fable 5.1 (batch): price unchanged since we started tracking it on 2026-09-03.
Which should you choose?
Choose Anthropic: Claude Fable 5.1 (batch) if…
- you need to fit long inputs in one request — 1M tokens is roughly 1,500 pages, against 197
- you need tool / function calling — to call your APIs and run agent loops; AionLabs: Aion-1.0 does not advertise it
- you need structured output (JSON schema) — to return JSON that validates against your schema; AionLabs: Aion-1.0 does not advertise it
- you need image input — to read screenshots, charts and scanned pages; AionLabs: Aion-1.0 does not advertise it
- you need file / PDF input — to accept documents without your own parsing step; AionLabs: Aion-1.0 does not advertise it
- you need built-in web search — to answer from live web results; AionLabs: Aion-1.0 does not advertise it
- you generate long outputs in one go — up to 128K tokens (about 96,000 words) per response
- you want the newer model — released 2026-09-01, 19 months after the other
Frequently asked questions
Is AionLabs: Aion-1.0 better than Anthropic: Claude Fable 5.1 (batch)?
Neither wins outright: AionLabs: Aion-1.0 is the pick when cost matters at scale, Anthropic: Claude Fable 5.1 (batch) when you need to fit long inputs in one request. In short: AionLabs: Aion-1.0 when cost matters at scale; Anthropic: Claude Fable 5.1 (batch) when you need to fit long inputs in one request, you need tool / function calling, you need structured output (JSON schema), you need image input, you need file / PDF input, you need built-in web search, you generate long outputs in one go, you want the newer model.
Which is cheaper, AionLabs: Aion-1.0 or Anthropic: Claude Fable 5.1 (batch)?
AionLabs: Aion-1.0 is cheaper: $5.00 vs $10.00 per 1M tokens at a typical 3:1 input/output mix, 50% less. For 50,000 support conversations a month that is $460 against $875.
How much do AionLabs: Aion-1.0 and Anthropic: Claude Fable 5.1 (batch) cost per million tokens?
AionLabs: Aion-1.0 costs $4.00 per 1M input tokens and $8.00 per 1M output tokens; Anthropic: Claude Fable 5.1 (batch) costs $5.00 input and $25.00 output. Output tokens are billed separately, so long answers shift the gap.
Which has the bigger context window, AionLabs: Aion-1.0 or Anthropic: Claude Fable 5.1 (batch)?
Anthropic: Claude Fable 5.1 (batch): 1M tokens, about 1,500 pages, against 131K (about 197 pages) for AionLabs: Aion-1.0.
Do AionLabs: Aion-1.0 and Anthropic: Claude Fable 5.1 (batch) support function calling and JSON output?
Tool calling — AionLabs: Aion-1.0: not advertised, Anthropic: Claude Fable 5.1 (batch): yes. JSON-schema structured output — AionLabs: Aion-1.0: not advertised, Anthropic: Claude Fable 5.1 (batch): yes.
Can AionLabs: Aion-1.0 or Anthropic: Claude Fable 5.1 (batch) read images?
Only Anthropic: Claude Fable 5.1 (batch) accepts image input; AionLabs: Aion-1.0 is text-only for input.
Is AionLabs: Aion-1.0 or Anthropic: Claude Fable 5.1 (batch) free to use?
No free variant is listed for either; both are pay-per-token.
What is the maximum output length of AionLabs: Aion-1.0 and Anthropic: Claude Fable 5.1 (batch)?
AionLabs: Aion-1.0 can write up to 33K tokens (about 24,600 words) per response; Anthropic: Claude Fable 5.1 (batch) up to 128K (about 96,000 words).
When were AionLabs: Aion-1.0 and Anthropic: Claude Fable 5.1 (batch) released?
AionLabs: Aion-1.0 was listed on 2025-02-04; Anthropic: Claude Fable 5.1 (batch) on 2026-09-01.
About the two models
AionLabs: Aion-1.0
Aion-1.0 is a multi-model system designed for high performance across various tasks, including reasoning and coding. It is built on DeepSeek-R1, augmented with additional models and techniques such as Tree of Thoughts (ToT) and Mixture of Experts (MoE). It is Aion Lab's most powerful reasoning model.
Full AionLabs: Aion-1.0 specs →Anthropic: Claude Fable 5.1 (batch)
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...
Full Anthropic: Claude Fable 5.1 (batch) specs →