GPT-6 Sol
Save 90%Officialopenai/gpt-6-sol
The mid tier of GPT-6 for complex coding and professional work at a lower cost.
- Context window
- 1.1M
- Max output
- 128K
- Input modalities
- text · image
- Output modalities
- text
- Capabilities
- Vision · Reasoning · Tool calling · Coding · Prompt cache · Paid cache writes · Normalize Openai Envelope · Strip Responses Summary Input
- Upstream release
- 2026-09-22
- RouteMux name
- openai/gpt-6-sol
Try GPT-6 Sol here
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What is GPT-6 Sol
GPT-6 Sol is the middle tier of OpenAI's GPT-6 family, released in September 2026 alongside GPT-6 Luna. It brings much of GPT-6 Astra's capability to a faster, cheaper model, and OpenAI positions it for complex coding and professional work at scale: multi-file changes, agent loops that call tools many times, and analysis over long documents.
It accepts text and image input, supports tool calling and explicit prompt caching, and exposes reasoning effort as a request parameter from none all the way to max. That range lets one deployment answer quick turns without reasoning and still think hard on the steps that need it.
Through RouteMux it is $0.20 per 1M input tokens against OpenAI's $2, and $1.00 against $10 on output. It is reachable over OpenAI Chat Completions, OpenAI Responses, and Anthropic Messages, so an Anthropic-shaped client can call it without rewriting its request layer.
GPT-6 Sol API pricing
Source: openai_x0.10 · Verified 2026-09-23
Fast $0.4 / $2 /M
Cache read $0.02/M · Cache write $0.25/M
| Tier | Input | Cache read | Cache write | Output |
|---|---|---|---|---|
| Standard ≤272K | $0.2 | $0.02 | $0.25 | $1 |
| Standard >272K | $0.4 | $0.04 | $0.5 | $1.5 |
| Priority ≤272K | $0.4 | $0.04 | $0.5 | $2 |
Estimate cost
Limited time20% extra Credits on your first top-up — up to 200 bonus Credits
Applies to your first top-up within 72 hours of signing up. Minimum $20, once per account.
Key capabilities
Built for complex work
Aimed at coding, agent workflows and professional knowledge work where Luna is not enough but Astra is more than the task needs.
Reasoning from none to max
Effort is a request parameter spanning none, low, medium, high, xhigh and max.
Vision and tools included
Image input, tool calling and explicit prompt caching are all supported.
Three protocols
OpenAI Chat, OpenAI Responses, and Anthropic Messages all route to this model.
Interface and protocols
Use any of these IDs to call this model via the API.
openai/gpt-6-solReplace the ROUTEMUX_KEY placeholder with your API key. Create one →
from openai import OpenAI
client = OpenAI(
base_url="https://api.routemux.com/v1",
api_key="<ROUTEMUX_KEY>",
)
completion = client.chat.completions.create(
model="openai/gpt-6-sol",
messages=[{"role": "user", "content": "What is the meaning of life?"}],
)
print(completion.choices[0].message.content)Performance (last 30 days)
GPT-6 Sol FAQ
›What is GPT-6 Sol?
The mid tier of GPT-6 for complex coding and professional work at a lower cost.
›How large is the context window of GPT-6 Sol?
GPT-6 Sol supports a context window of up to 1.1M tokens, with up to 128K output tokens per request.
›How much does the GPT-6 Sol API cost?
Through RouteMux, GPT-6 Sol costs $0.2 for input and $1 for output (USD per 1M tokens), below the official list price.
›How do I call GPT-6 Sol via API?
GPT-6 Sol is OpenAI-compatible: point your base URL at RouteMux and set the model field to openai/gpt-6-sol — no code changes needed.
›Which input and output modalities does GPT-6 Sol support?
GPT-6 Sol accepts text, image as input and produces text as output.
›When was GPT-6 Sol released?
GPT-6 Sol was released on September 22, 2026.
›How do Sol, Luna and Astra differ?
They are the three tiers of GPT-6. Luna is the high-volume tier for simple, well-defined steps; Sol is the everyday tier for complex coding and agent work; Astra is the flagship for the hardest problems.
›Can reasoning be turned off?
Yes. Sol accepts a reasoning effort of none, as well as low, medium, high, xhigh and max.
›Does the price change for very long inputs?
Yes. Requests whose input exceeds 272K tokens bill at the long-context rate. The pricing section above lists every tier.