// head_to_head
Claude Fable 5.1 vs Xing4.0 29B A4B (free)
Published LiveBench scores across all seven categories, live list pricing, context windows, and the measured cost of a point of capability — for both models, side by side.
Xing4.0 29B A4B (free) is the cheaper of the two; neither can be ranked on quality here.
Xing4.0 29B A4B (free) does not have a published LiveBench run, so this comparison covers price, context and declared capabilities only. A missing score means "not evaluated", not "worse" — the right way to separate these two is an eval on your own workload.
anthropic
Claude Fable 5.1
- Blended / 1M
- $20.00
- Context
- 1M
- Released
- Sep 1, 2026
- Overall score
- 88.0
xingchen-agi
Xing4.0 29B A4B (free)
- Blended / 1M
- Free
- Context
- 262K
- Released
- Oct 16, 2026
- Overall score
- Not evaluated
Specs and pricing
| Metric | Claude Fable 5.1 | Xing4.0 29B A4B (free) |
|---|---|---|
| LiveBench overall Mean of the seven LiveBench category scores, 0–100. Higher is better. | 88.0 | — |
| Cost per point Measured benchmark spend divided by overall score — dollars per point of capability. | $3.07 | — |
| Blended price / 1M 3:1 input:output mix, the usual shape of production traffic. | $20.00 | Freewin |
| Input price / 1M | $10.00 | Freewin |
| Output price / 1M | $50.00 | Freewin |
| Cached input / 1M Price of an input token served from the prompt cache, where the provider publishes one. | $0.250 | — |
| Context window | 1Mwin | 262K |
| Max output tokens | 128K | 236Kwin |
Benchmarks by category
An overall score averages away the thing you probably care about. These are the seven LiveBench categories scored separately — Claude Fable 5.1 on top, Xing4.0 29B A4B (free) below, both out of 100.
What each one costs to run
Per-token prices are hard to feel. These are monthly list costs for both models across five workload shapes, using each provider's published cached-input rate where there is one.
| Workload | Claude Fable 5.1 | Xing4.0 29B A4B (free) |
|---|---|---|
| Support chatbot 1.2K in / 400 out × 200K requests | $5,698/mo | $0/mo |
| RAG assistant 8K in / 600 out × 100K requests | $7,100/mo | $0/mo |
| Coding agent 40K in / 4K out × 20K requests | $6,540/mo | $0/mo |
| Document extraction 20K in / 1.5K out × 50K requests | $13,263/mo | $0/mo |
| Bulk classification 500 in / 20 out × 5M requests | $25,125/mo | $0/mo |
Which should you pick?
You need to fit large documents in one call
Claude Fable 5.1
Wider context window — 1M against 262K.
You are cost-constrained
Xing4.0 29B A4B (free)
Cheaper on blended list price at Free per million tokens.
Claude Fable 5.1 vs Xing4.0 29B A4B (free) FAQ
Which is better, Claude Fable 5.1 or Xing4.0 29B A4B (free)?
Xing4.0 29B A4B (free) is the cheaper of the two; neither can be ranked on quality here. Xing4.0 29B A4B (free) does not have a published LiveBench run, so this comparison covers price, context and declared capabilities only. A missing score means "not evaluated", not "worse" — the right way to separate these two is an eval on your own workload.
Is Claude Fable 5.1 cheaper than Xing4.0 29B A4B (free)?
Xing4.0 29B A4B (free) is cheaper. On a 3:1 input:output blend, Claude Fable 5.1 lists at $20.00 per million tokens and Xing4.0 29B A4B (free) at Free. Input and output are priced separately — Claude Fable 5.1 charges $10.00 in and $50.00 out, Xing4.0 29B A4B (free) charges Free and Free — so the model that looks cheaper flips depending on how output-heavy your workload is.
Does Claude Fable 5.1 or Xing4.0 29B A4B (free) have a bigger context window?
Claude Fable 5.1 has the larger context window: 1M for Claude Fable 5.1 against 262K for Xing4.0 29B A4B (free). Note that a window you can fill is not a window you should fill — retrieval quality usually degrades well before the limit, and you pay for every token you put in it.
Do Claude Fable 5.1 and Xing4.0 29B A4B (free) support prompt caching?
Claude Fable 5.1 publishes a cached-input rate of $0.250 per million tokens against a full input rate of $10.00. The catalogue lists no separate cached rate for Xing4.0 29B A4B (free), which means the provider does not price it separately here — not that caching is unavailable.
Related comparisons
How these numbers are produced
- Price — provider list price from OpenRouter, refreshed every 15 minutes. “Blended” is a 3:1 input:output mix.
- Scores — LiveBench release 2026-09-02, using their own category map. Each model shows its strongest published run. A blank means “not evaluated”, never “bad”.
- Cost per point — the measured dollars LiveBench spent on the run, divided by the score it earned.
- “Win” — awarded only past a threshold: one full point on a benchmark score, 10% on a price, 25% on a context window. Anything tighter reports as a tie, because effort settings alone move a LiveBench score by more than that.
Published benchmarks rank models on someone else's tasks. Before committing, see LLM & agent evaluation for building an eval on your own.