How much faster is GPT-6.1 Sol Ultrafast than Standard?

OpenAI says Ultrafast can deliver up to 8 times faster token generation than GPT-6.1 Sol Standard. This is a maximum claim, not a latency guarantee for every request.

Is GPT-6.1 Sol Ultrafast a separate model?

No. It is a service tier for the gpt-6.1-sol model. API requests select it by setting service_tier to ultrafast in the Responses API.

When should I use Ultrafast instead of Standard?

Use Ultrafast when lower latency has measurable business value, such as live agents, interactive coding or incident response. Standard is usually more economical for offline or delay-tolerant work.

Who can use GPT-6.1 Sol Ultrafast?

OpenAI documents Ultrafast for GPT-6.1 Sol as available to all API users, with separate rate limits. Product-plan access in Codex and ChatGPT Work follows separate eligibility rules.

OPENAI API · VERIFIED OCTOBER 9, 2026

GPT-6.1 Sol Ultrafast
vs Standard

Q: How much does GPT-6.1 Sol Ultrafast cost?

OpenAI states that Ultrafast mode costs 6 times the Standard rate. For short-context GPT-6.1 Sol requests, that is $12 per million input tokens, $0.60 cached input, $15 cache writes and $60 output.

Ultrafast runs the same GPT-6.1 Sol model on OpenAI’s fastest API service tier. The tradeoff is explicit: up to 8× faster token generation for 6× the Standard token price.

THE SHORT ANSWER

Choose Ultrafast only when waiting costs more than tokens.

Ultrafast does not buy a different model or higher intelligence. It buys lower latency. Standard remains the economical default; Ultrafast is most defensible for interactive agents, production incidents and live user experiences where seconds affect completion or revenue.

01 / API PRICING

Ultrafast costs 6× the Standard token rate.

GPT-6.1 Sol short-context prices in USD per one million tokens. OpenAI applies higher long-context rates above 272K input tokens.

Token category	Standard	Ultrafast	Premium
Input	$2.00	$12.00	6×
Cached input	$0.10	$0.60	6×
Cache write	$2.50	$15.00	6×
Output	$10.00	$60.00	6×

OpenAI also offers Fast mode at 2× Standard. Batch and Flex cost 50% less than Standard, but target different latency and scheduling needs.

02 / SPEED

“Up to 8× faster” is a ceiling, not a promise.

OpenAI’s comparison refers to token generation speed. End-to-end latency also includes network time, time to first token, reasoning, tools and your application.

1×

Standard baseline for GPT-6.1 Sol.

6×

Ultrafast token-price multiplier.

Up to 8×

OpenAI’s stated maximum token-generation speedup versus Standard.

Implementation note:

OpenAI recommends WebSockets for agentic applications with frequent tool calls. Repeated HTTP connection overhead can reduce the latency benefit.

03 / WORKED COST

A 100K-input, 20K-output request costs $0.40 or $2.40.

Short-context list prices, no cache writes or paid tools.

$0.40

Standard: 100K × $2/MTok + 20K × $10/MTok.

$2.40

Ultrafast: 100K × $12/MTok + 20K × $60/MTok.

+$2.00

Latency premium per request in this example.

Ultrafast value = time saved × value per second − extra API cost

Benchmark p50 and p95 completion time on the same prompts. “Tokens per second” alone does not capture time to first token or tool latency.

04 / DECISION

Which GPT-6.1 Sol service tier should you use?

Use Standard

Background analysis and asynchronous jobs
Content generation where users do not wait live
High-volume workloads with tight unit economics
Evaluation runs and non-urgent coding tasks

Test Ultrafast

Interactive coding and computer-use agents
Incident response and production debugging
Live assistants with multi-step tool calls
Workflows where lower latency improves conversion

05 / API SETUP

Use the same model ID and change the service tier.

model: "gpt-6.1-sol"
service_tier: "ultrafast"

Use the Responses API. Ultrafast has separate rate limits; check the limits shown for your organization before moving production traffic.

06 / FAQ

GPT-6.1 Sol Ultrafast answers

How much does GPT-6.1 Sol Ultrafast cost?

For short-context requests, $12 input, $0.60 cached input, $15 cache writes and $60 output per million tokens. OpenAI summarizes this as 6× Standard pricing.

Is Ultrafast really eight times faster?

OpenAI says “up to 8× faster token generation.” Treat that as a maximum vendor claim. Actual end-to-end latency depends on request shape, reasoning, network and tool calls.

Is Ultrafast a different GPT-6.1 Sol model?

No. It is a service tier selected for gpt-6.1-sol by setting service_tier to ultrafast.

Is GPT-6.1 Sol Ultrafast available to all API users?

OpenAI’s API documentation says it is available to all API users and has separate token rate limits. Codex and ChatGPT Work access follows separate plan eligibility.

Does Ultrafast support data residency?

OpenAI documents US and EU data residency plus global processing for GPT-6.1 Sol Ultrafast, subject to data-residency eligibility.

Method and sources. Prices, availability and configuration were checked against OpenAI’s official documentation on October 9, 2026. “Up to 8×” is OpenAI’s maximum speed claim, not an independent benchmark or SLA. This site is independent and is not affiliated with OpenAI. Ultrafast guide · GPT-6.1 Sol model page · OpenAI announcement.

GPT-6.1 Sol Ultrafastvs Standard