// alternatives · October 2026
GPT-6 Astra 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 GPT-6 Astra does.
The closest cheaper alternative to GPT-6 Astra is Claude Opus 5.5 — effectively the same overall score, 60% cheaper on LiveBench and list price.
GPT-6 Astra: 85.6 overall on LiveBench, $20.00 per 1M blended tokens, about $7,400/mo for a RAG assistant.
Cheaper, close in quality
Lower list price and within 5 points of GPT-6 Astra on LiveBench overall — the switches least likely to be noticed by users. Strongest first.
| Model | Overall | vs GPT-6 Astra | 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 GPT-6 Astra, 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 GPT-6 Astra | Blended / 1M | RAG assistant | Context |
|---|---|---|---|---|---|
| DeepSeek V4.1 Flash 1017deepseek 11.6 points lower overall, 97% cheaper. Head to head → | 74.0 | −11.6 | $0.525−97% | $194.40/mo | 1.0M |
| GPT-6.1 Terraopenai 7.8 points lower overall, 90% cheaper. Head to head → | 77.8 | −7.8 | $2.00−90% | $720.00/mo | 1.1M |
| Claude Sonnet 5.5anthropic 5.6 points lower overall, 80% cheaper. Head to head → | 80.0 | −5.6 | $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 GPT-6 Astra there. Useful when your workload is mostly one kind of task.
| Category | Cheapest match | Score | Blended / 1M |
|---|---|---|---|
| Coding | DeepSeek V4.1 Flash 1017 | 96.0 vs 93.7 | $0.525−97% |
| Reasoning | Gemini 4 Argon | 95.1 vs 92.7 | $4.00−80% |
| Browser | GPT-6.1 Terra | 93.1 vs 91.3 | $2.00−90% |
| Data analysis | Gemini 4 Argon | 85.2 vs 83.0 | $4.00−80% |
| Research | SpaceXAI: Grok 4.7 | 86.4 vs 85.2 | $3.00−85% |
| Documents & design | Claude Haiku 5.5 | 83.1 vs 82.0 | $0.200−99% |
GPT-6 Astra alternatives FAQ
What is the best alternative to GPT-6 Astra?
Claude Opus 5.5. Effectively the same overall score, 60% cheaper. Every suggestion supports tool calling and image input, like GPT-6 Astra.
What is the cheapest alternative to GPT-6 Astra?
DeepSeek V4.1 Flash 1017 at $0.525 per 1M blended tokens, scoring 74.0 overall against GPT-6 Astra's 85.6. On a RAG assistant at 100K requests a month that is $194.40 instead of $7,400.
Is there a cheaper model that matches GPT-6 Astra on specific tasks?
Yes, in 6 of the seven LiveBench categories. For example, coding: DeepSeek V4.1 Flash 1017 (96.0 vs 93.7); reasoning: Gemini 4 Argon (95.1 vs 92.7); browser: GPT-6.1 Terra (93.1 vs 91.3).
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 GPT-6 Astra 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.