GPT-6.1 Sol

Save 90%Official

openai/gpt-6.1-sol

An upgrade to GPT-6 Sol that OpenAI says comes close to GPT-6 Astra on agentic coding and professional work.

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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
Upstream release: 2026-09-29
RouteMux name: openai/gpt-6.1-sol

Live model playground

Try GPT-6.1 Sol here

Tune the request, see the current price ceiling, and inspect the real response without leaving this model page.

streamchat

1Configure input

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Maximum estimated cost—

2Live result

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Enter an input on the left. The same RouteMux Playground execution and billing path powers this embedded test.

What is GPT-6.1 Sol

GPT-6.1 Sol is an upgrade to GPT-6 Sol, released by OpenAI on September 29, 2026. OpenAI describes it as near-Astra performance for complex coding, computer use and professional work, at the cost of the Sol tier rather than the flagship.

It accepts text and image input, supports tool calling and explicit prompt caching, and exposes reasoning effort as a request parameter from low to max. Unlike GPT-6 Sol it does not accept an effort of none, so every request does at least some reasoning.

Through RouteMux it is $0.20 per 1M input tokens against OpenAI's $2, $1.00 against $10 on output, and $0.01 against $0.10 for cached input. 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-6.1 Sol API pricing

Source: openai_x0.10 · Verified 2026-09-30

InputOfficial $2 / M tokens

$0.2/ M tokensSave 90%

OutputOfficial $10 / M tokens

$1/ M tokensSave 90%

Fast $0.4 / $2 /M

Cache read $0.01/M · Cache write $0.25/M

Tier	Input	Cache read	Cache write	Output
Standard ≤272K	$0.2$2−90%	$0.01~~$0.1~~−90%	$0.25~~$2.5~~−90%	$1~~$10~~−90%
Standard >272K	$0.4$4−90%	$0.02~~$0.2~~−90%	$0.5$5−90%	$1.5~~$15~~−90%
Priority ≤272K	$0.4$4−90%	$0.02~~$0.2~~−90%	$0.5$5−90%	$2~~$20~~−90%
Priority >272K	$0.8$8−90%	$0.04~~$0.4~~−90%	$1~~$10~~−90%	$3~~$30~~−90%

Estimate cost

Input tokensOutput tokens

Estimated cost$0.003

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

Near-Astra on agentic work

OpenAI positions it close to GPT-6 Astra on agentic coding, computer use and professional work.

Reasoning from low to max

Effort is a request parameter spanning low, medium, high, xhigh and max. None is not accepted.

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

OpenAI Chat CompletionsStreamingOpenAI ResponsesStreamingAnthropic MessagesStreaming

Use any of these IDs to call this model via the API.

RouteMux nameopenai/gpt-6.1-sol

Replace 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-6.1-sol",
    messages=[{"role": "user", "content": "What is the meaning of life?"}],
)
print(completion.choices[0].message.content)

base_url: https://api.routemux.com/v1

Performance (last 30 days)

0 requests · last 30 days

Total usage—

P50 first-token latencyInsufficient data (0 requests)

Avg throughputInsufficient data (0 requests)

Success rate100.0%

Uptime · 24htested via openai_chat

100.00%

GPT-6.1 Sol FAQ

›What is GPT-6.1 Sol?

An upgrade to GPT-6 Sol that OpenAI says comes close to GPT-6 Astra on agentic coding and professional work.

›How large is the context window of GPT-6.1 Sol?

GPT-6.1 Sol supports a context window of up to 1.1M tokens, with up to 128K output tokens per request.

›How much does the GPT-6.1 Sol API cost?

Through RouteMux, GPT-6.1 Sol costs $0.2 for input and $1 for output (USD per 1M tokens), below the official list price.

›How do I call GPT-6.1 Sol via API?

GPT-6.1 Sol is OpenAI-compatible: point your base URL at RouteMux and set the model field to openai/gpt-6.1-sol — no code changes needed.

›Which input and output modalities does GPT-6.1 Sol support?

GPT-6.1 Sol accepts text, image as input and produces text as output.

›When was GPT-6.1 Sol released?

GPT-6.1 Sol was released on September 29, 2026.

›How is GPT-6.1 Sol different from GPT-6 Sol?

It is OpenAI's upgrade to Sol, aimed at agentic coding, computer use and professional work. The request surface is the same except for reasoning effort: 6.1 Sol no longer accepts none.

›Can reasoning be turned off?

No. GPT-6.1 Sol accepts low, medium, high, xhigh and max; OpenAI rejects a request with effort none or minimal. Use low for the fastest turns. GPT-6 Sol still accepts none if you need reasoning off entirely.

›Does the price change for very long inputs?

Yes. Requests whose input exceeds 272K tokens bill the whole request at the long-context rate. The pricing section above lists every tier.

Sources

Reviewed by Jerry Fan on 2026-09-30

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