GPT-6 Astra vs GPT-6.1 Sol: which API costs less?
Averaged across three realistic workloads, GPT-6.1 Sol is about 81% cheaper than GPT-6 Astra. Below: raw rates and side-by-side monthly costs, computed from prices verified 2026-10-17 (we track what you are billed today, promos included).
Rates per 1M tokens
| Model | Input | Output | Cached input |
|---|---|---|---|
| GPT-6 AstraOpenAI | $10 | $50 | $1 |
| GPT-6.1 SolOpenAI | $2 | $10 | $0.100 |
Monthly cost, side by side
| Workload | GPT-6 Astra | GPT-6.1 Sol | Difference |
|---|---|---|---|
Customer-support chatbot 2M input + 0.5M output tokens/month, 60% of input served from prompt cache | $34.20 | $6.72 | GPT-6.1 Sol −80% |
RAG / document Q&A 20M input + 1M output tokens/month, 70% cached (shared context) | $124 | $23.40 | GPT-6.1 Sol −81% |
Agentic coding assistant 50M input + 5M output tokens/month, 80% cached (long sessions) | $390 | $74.00 | GPT-6.1 Sol −81% |
Your traffic looks different? Run your own numbers in the calculator.
FAQ
Which is cheaper: GPT-6 Astra or GPT-6.1 Sol?
Across three realistic workloads (chatbot, RAG, agent), GPT-6.1 Sol works out about 81% cheaper than GPT-6 Astra on average. Raw rates: GPT-6 Astra $10/$50 per 1M tokens vs GPT-6.1 Sol $2/$10. Verified 2026-10-17.
Does prompt caching change the comparison?
Yes — cached input costs $1 on GPT-6 Astra and $0.100 on GPT-6.1 Sol. Our scenario numbers already include realistic cache hit rates.
Is cheaper always better?
No. Price is one axis — model capability, context window and latency differ. This page answers only the cost question; benchmark quality on your own tasks before switching.