GPT-5.5 · OpenAI

What does GPT-5.5 cost to run in a coding agent?

GPT-5.5 costs about $0.21 per average coding-agent request on our measured traffic, at list prices of $5 per million input and $30 per million output tokens. It scores 38 on the Artificial Analysis Intelligence Index, 21st of the 48 models we track. Source: Artificial Analysis (artificialanalysis.ai)

List prices: OpenAI API pricing, checked 2026-10-13. Request costs: Standard Compute gateway data, 79,301 coding-agent requests from 75 users, Sep 13 to Oct 12, 2026. How we compute this

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What GPT-5.5 costs per coding-agent request

Cost at list price	GPT-5.5
Prompt under 100K tokens50% of requests, 87% of input cached	$0.081
Prompt of 100K to 272K39% of requests, 88% of input cached	$0.20
Prompt over 272K tokens11% of requests, 86% of input cached	$0.86
Average request	$0.21
100 requests	$20.99
Median session16 requests; a session ends after 10 idle minutes	$2.30
A month of regular usemedian of 20 users active on 5+ days	$296

Each logged request priced at the vendor’s list rates for its own token counts, including cache reads and any higher rate for long prompts. Average output: 698 tokens per request.

GPT-5.5 benchmarks, speed and latency

Artificial Analysis	Value	Rank
Intelligence Index10 evaluations, 0 to 100	38	21 of 48
Terminal-Bench 4.0agentic coding in a terminal	14.6%	20 of 39
Output speedmedian	105 tokens/s	18 of 44
Time to first answer tokenincludes thinking time	71 s	25 of 44

Source: Artificial Analysis (artificialanalysis.ai). Measured variant: GPT-5.5 (Xhigh), speed on OpenAI. Fetched October 13, 2026. Rank is among the models on this site, older versions included. Artificial Analysis runs Terminal-Bench 4.0 in its own setup, so its scores differ from the tbench.ai leaderboard.

About GPT-5.5

GPT-5.5 was OpenAI's flagship from April 23, 2026, with a 1,050,000-token context at $5/$30 per million tokens. The GPT-5.6 and GPT-6 families have since overtaken it: it scores 38 on the Artificial Analysis Intelligence Index and 14.6% in Artificial Analysis's Terminal-Bench 4.0 run, against 52 and 56.1% for GPT-6.1 Sol, which costs about a third as much per request in our measurements ($0.067 vs $0.21). It retires from ChatGPT and Codex with ChatGPT sign-in on October 14, 2026; Codex on an API key can still use it.

Sources: Artificial Analysis

GPT-5.5 FAQ

How much does GPT-5.5 cost per coding-agent request?

$0.21 on average at list price, $20.99 per 100 requests, and $2.30 for a median 16-request session. That is 79,301 real coding-agent requests (Sep 13 to Oct 12, 2026) priced at OpenAI's list rates; the median request sent 99,534 input tokens, 87% of input was read from cache, and requests returned 698 output tokens on average.

Does GPT-5.5 charge more for long prompts?

Yes. Prompts over 272K tokens are billed at $10 per million input and $45 per million output tokens, on every token in the request including cache reads. 11% of the coding-agent requests we measured were that large.

How fast is GPT-5.5?

Artificial Analysis measures GPT-5.5 (Xhigh) at 105 output tokens per second, with 71 seconds to the first answer token, thinking time included, on OpenAI's API. Source: Artificial Analysis (artificialanalysis.ai).

Is GPT-5.5 good for AI agents?

Existing GPT-5.5 setups on an API key until they move to GPT-6.1 Sol. On our scoring, which is calibrated to public benchmarks, it rates 6.2/10 for agentic ability and 7.6/10 for output quality. 1M-token context.

What is GPT-5.5's context window?

GPT-5.5 has a 1.1M-token context window, large enough to hold sizeable codebases or document sets in a single run. OpenAI is the maker.

Can I self-host GPT-5.5?

No. GPT-5.5 is a proprietary, hosted-only model from OpenAI. You access it through an API, such as OpenRouter, rather than running the weights yourself.

What are the downsides of GPT-5.5?

The main trade-offs: Superseded: GPT-6.1 Sol scores higher at about a third of the cost per request; Premium pricing ($5/$30 per million); Retires from ChatGPT and Codex sign-in on October 14, 2026. It's strongest for existing GPT-5.5 setups on an API key until they move to GPT-6.1 Sol.