// alternatives · October 2026
Claude Fable 5.1 alternatives
Cheaper models that come close, budget substitutes, and the cheapest step up — chosen on published LiveBench scores and live list price, never on our opinion. Every model here supports tool calling and image input, as Claude Fable 5.1 does.
The closest cheaper alternative to Claude Fable 5.1 is Claude Opus 5.5 — effectively the same overall score, 60% cheaper on LiveBench and list price.
Claude Fable 5.1: 85.7 overall on LiveBench, $20.00 per 1M blended tokens, about $7,100/mo for a RAG assistant.
Cheaper, close in quality
Lower list price and within 5 points of Claude Fable 5.1 on LiveBench overall — the switches least likely to be noticed by users. Strongest first.
| Model | Overall | vs Claude Fable 5.1 | Blended / 1M | RAG assistant | Context |
|---|---|---|---|---|---|
| Claude Opus 5.5anthropic Effectively the same overall score, 60% cheaper. Head to head → | 85.1 | −0.5 | $8.00−60% | $2,880/mo | 1M |
| GPT-6.1 Solopenai 1.6 points lower overall, 80% cheaper. Head to head → | 84.1 | −1.6 | $4.00−80% | $1,440/mo | 1.1M |
Budget substitutes
Within 15 points of Claude Fable 5.1, cheapest first — and only models that are the best score at their price, so nothing here is beaten by a cheaper pick. Worth testing for high-volume traffic where the last few points matter less than the bill.
| Model | Overall | vs Claude Fable 5.1 | Blended / 1M | RAG assistant | Context |
|---|---|---|---|---|---|
| DeepSeek V4.1 Flash 1017deepseek 11.7 points lower overall, 97% cheaper. Head to head → | 74.0 | −11.7 | $0.525−97% | $194.40/mo | 1.0M |
| GPT-6.1 Terraopenai 7.9 points lower overall, 90% cheaper. Head to head → | 77.8 | −7.9 | $2.00−90% | $720.00/mo | 1.1M |
| Claude Sonnet 5.5anthropic 5.7 points lower overall, 80% cheaper. Head to head → | 80.0 | −5.7 | $4.00−80% | $1,440/mo | 1M |
Match it on one task for less
For each LiveBench category, the cheapest model that scores at least as well as Claude Fable 5.1 there. Useful when your workload is mostly one kind of task.
| Category | Cheapest match | Score | Blended / 1M |
|---|---|---|---|
| Reasoning | Gemini 4 Argon | 95.1 vs 91.7 | $4.00−80% |
| Browser | GPT-6.1 Terra | 93.1 vs 89.8 | $2.00−90% |
| Data analysis | GPT-6.1 Terra | 82.3 vs 80.3 | $2.00−90% |
| Research | SpaceXAI: Grok 4.7 | 86.4 vs 82.0 | $3.00−85% |
| Documents & design | DeepSeek V4.1 Flash 1017 | 83.4 vs 83.4 | $0.525−97% |
Claude Fable 5.1 alternatives FAQ
What is the best alternative to Claude Fable 5.1?
Claude Opus 5.5. Effectively the same overall score, 60% cheaper. Every suggestion supports tool calling and image input, like Claude Fable 5.1.
What is the cheapest alternative to Claude Fable 5.1?
DeepSeek V4.1 Flash 1017 at $0.525 per 1M blended tokens, scoring 74.0 overall against Claude Fable 5.1's 85.7. On a RAG assistant at 100K requests a month that is $194.40 instead of $7,100.
Is there a cheaper model that matches Claude Fable 5.1 on specific tasks?
Yes, in 5 of the seven LiveBench categories. For example, reasoning: Gemini 4 Argon (95.1 vs 91.7); browser: GPT-6.1 Terra (93.1 vs 89.8); data analysis: GPT-6.1 Terra (82.3 vs 80.3).
How alternatives are chosen
- Scores — LiveBench release 2026-10-25. Only models with a published run are suggested on quality; a missing model means “not evaluated”, not “worse”.
- Prices — live list prices from OpenRouter, blended 3:1 input:output. Monthly figures price a RAG assistant with the published cached-input rate where there is one.
- Same job — suggestions must support every capability Claude Fable 5.1 has among tool calling and image input. Other listings of the same model (free or batch tiers) are variants, not alternatives, and are left out.
A few points on a public benchmark can hide large differences on your own tasks. Shortlist here, then decide with an eval — how to build one.