GPT-6.1 Sol vs GPT-6 Astra
Specs and prices below are quoted from official vendor documentation (Anthropic, OpenAI), checked on 2026-10-16. Prices are the vendors’ list prices, not byesu’s; on byesu you are billed per token and see the actual price in the model list after you sign in.
At a Glance
| Item | GPT-6.1 Sol | GPT-6 Astra |
|---|---|---|
| Vendor | OpenAI | OpenAI |
| Official positioning | “Near-Astra performance for complex work at a lower cost” | “Most capable model for the most demanding work” |
| Model ID on byesu | gpt-6.1-sol | gpt-6-astra |
| Context window | 1.05M | 1.05M |
| Max output | 128K | — |
| Knowledge cutoff | Apr 30, 2026 | — |
| Reasoning control | low / medium (default) / high / xhigh / max | — |
| Official list price (input / output per 1M tokens) | $2 / $10 | $10 / $50 |
| Official cached-input price (per 1M) | $0.10 | — |
| Official cost of 1M input + 200K output | $4 | $20 |
Key Differences
- Price: GPT-6.1 Sol’s list price is one-fifth of GPT-6 Astra’s ($2/$10 vs $10/$50 per million input/output tokens).
- Capability: OpenAI calls Astra its “most capable model for the most demanding work” and describes GPT-6.1 Sol as “near-Astra performance for complex work at a lower cost”.
- Context: both have a 1.05M-token context window.
- Generation: GPT-6.1 Sol is the newer release. OpenAI did not release a GPT-6.1 version of Astra.
Which One Should You Pick?
- Default choice for coding, agents and most production work: GPT-6.1 Sol — OpenAI positions it close to Astra at a fifth of the price.
- The hardest tasks where a measurable quality gain justifies 5× the price: test GPT-6 Astra on those tasks specifically.
- Decide with data: route the same hard prompts through both and compare results and charges in your console.
Use Both With One Key
Both models are on byesu with the default auto-group token. To compare them on your own workload, keep the base URL and token and change only the model ID:
from openai import OpenAI
client = OpenAI(api_key="sk-YOUR_TOKEN", base_url="https://byesu.com/v1")
for model in ["gpt-6.1-sol", "gpt-6-astra"]:
resp = client.chat.completions.create(
model=model,
messages=[{"role": "user", "content": "Summarize this repository’s architecture"}],
)
print(model, resp.usage, resp.choices[0].message.content[:200])FAQ
How much cheaper is GPT-6.1 Sol than GPT-6 Astra?
At list price GPT-6.1 Sol is one-fifth the cost: $2 vs $10 per million input tokens and $10 vs $50 per million output tokens.
Is there a GPT-6.1 Astra?
No. OpenAI released GPT-6.1 Sol but did not release a GPT-6.1 version of Astra; GPT-6 Astra remains the top tier.
Can I switch between them without changing code?
Yes. On byesu both are available with the same token and base URL (https://byesu.com/v1); change the model ID between gpt-6.1-sol and gpt-6-astra.