How much does GPT-5.5 Instant cost?

We do not hold a list price for GPT-5.5 Instant yet, so we cannot compare its cost. Check the maker's own price page.

Is GPT-5.5 Instant open source?

We list GPT-5.5 Instant as closed: it is used through its maker's apps or API and its weights are not published (Epoch AI lists its access as "API access").

How good is GPT-5.5 Instant compared with other AI models?

On the Epoch Capabilities Index, GPT-5.5 Instant scores 142.4 (likely range 139.7 to 145.3), which ranks 107 of 270 models we track. On Arena's human-vote text board it is ranked 37 of 166. Scores close together are a tie in practice.

How does GPT-5.5 Instant compare with Qwen3.5-35B-A3B?

GPT-5.5 Instant scores higher on 2 of 5 shared quality measures, Qwen3.5-35B-A3B on 0. 3 measures are too close to call. See the full comparison for every measure.

How current are these numbers for GPT-5.5 Instant?

The newest data on this page is dated 26 Oct 2026. Scores come from Epoch AI and Arena, prices from the open LiteLLM price list.

AI Rankings

GPT-5.5 Instant: Score, Price and Context Window

Where GPT-5.5 Instant from OpenAI ranks, what it costs and how much text it can read, in plain numbers with the sources.

Data updated 26 Oct 2026

OpenAI
Closed weights
Released May 2026

Its score range overlaps with Qwen3.5-35B-A3B, the model just above it, so a small gap in rank is not a meaningful difference.

Key facts

Overall score: 142.4; Rank 107 of 270. Likely range 139.7 to 145.3.
Human preference: chat: 1473; Rank 37 of 166. 27,163 votes.
Human preference: coding: 1513; Rank 43 of 166. 7,912 votes.
Human preference: images: 1276; Rank 26 of 85. 7,590 votes.
Weights: Closed; Used through the maker's apps or API (Epoch AI: API access).

We do not have a list price and a context window size for GPT-5.5 Instant yet. It is shown as "Not measured" rather than guessed.

Try itChatGPT in our AI tools directoryOpenAI's AI assistant for writing, coding, research, file analysis, and connected work across chats and projects.

How GPT-5.5 Instant stacks up

Each strip shows every model we track as faint bars. The dot is this model. Better is always to the right, even for price.

GPT-5.5 Instant compared with all models we trackOverall capability: 142.4. Better than 60% of the other 269 models. Human preference: chat: 1473. Better than 78% of the other 165 models. Human preference: coding: 1513. Better than 74% of the other 165 models. Human preference: images: 1276. Better than 70% of the other 84 models.

Overall capability142.4
Better than 60% of the other 269 modelsUpper half
Epoch Capabilities Index: one score that combines many tests.
Human preference: chat1473
Better than 78% of the other 165 modelsTop 25%
How often people pick its answers over another model's on Arena.
Human preference: coding1513
Better than 74% of the other 165 modelsUpper half
How often people pick its answers to coding questions on Arena.
Human preference: images1276
Better than 70% of the other 84 modelsUpper half
How often people pick its answers about pictures on Arena.

Compared with the other published models that have each measure. Data updated 26 Oct 2026.

Where GPT-5.5 Instant ranks

Leaderboards it appears on, best placing first.

See all leaderboards

Test results

Each test checks one kind of skill. Place shows where it stands among the models that took that test.

GPQA Diamond
Very hard multiple-choice science questions in biology, physics and chemistry, written by experts and designed so a quick web search does not give the answer.
82.5%
Place 79 of 183
OTIS Mock AIME
Maths competition problems in the style of the US AIME exam, from the 2024 and 2025 sets. Every answer is a whole number.
68.1%
Place 102 of 174
FrontierMath (Tiers 1-3)
Original, very hard maths problems written by mathematicians. Each has an exact answer and the problems are kept private so models cannot have memorised them. This is the Tiers 1 to 3 set, version 2.
26.3%
Place 69 of 87

Similar models

Models from other makers with a similar overall score.

Learn more

Questions about GPT-5.5 Instant

How much does GPT-5.5 Instant cost?: We do not hold a list price for GPT-5.5 Instant yet, so we cannot compare its cost. Check the maker's own price page.
Is GPT-5.5 Instant open source?: We list GPT-5.5 Instant as closed: it is used through its maker's apps or API and its weights are not published (Epoch AI lists its access as "API access").
How good is GPT-5.5 Instant compared with other AI models?: On the Epoch Capabilities Index, GPT-5.5 Instant scores 142.4 (likely range 139.7 to 145.3), which ranks 107 of 270 models we track. On Arena's human-vote text board it is ranked 37 of 166. Scores close together are a tie in practice.
How does GPT-5.5 Instant compare with Qwen3.5-35B-A3B?: GPT-5.5 Instant scores higher on 2 of 5 shared quality measures, Qwen3.5-35B-A3B on 0. 3 measures are too close to call. See the full comparison for every measure.
How current are these numbers for GPT-5.5 Instant?: The newest data on this page is dated 26 Oct 2026. Scores come from Epoch AI and Arena, prices from the open LiteLLM price list.

Where this data comes from

Epoch AI: Benchmark data: Epoch AI, 'Capabilities & benchmarking', epoch.ai/benchmarks (CC BY 4.0). We match models across sources, rank them and show them in charts. Scores are not changed. Epoch AI does not endorse this site.
Arena (formerly LMArena): Human-preference ratings: Arena (arena.ai) leaderboard dataset, CC BY 4.0. We keep the latest published ratings, match them to models from other sources and rank them. Ratings are not changed. Arena does not endorse this site.

Newest data on this page: 26 Oct 2026. Prices are list prices and change often, so confirm on the maker's site before you buy. Sponsors never change a score or an order. How we calculate this · Report a mistake