GPT-5.5 (medium)

By OpenAI · released 2026-04-23 (2 months) · snapshot 2026-07-17

Off the frontierOn frontier at launch dayproprietary
Intelligence index
50.40
Cost to run the AA index
$936
Price per 1M tokens (in / out)
$5.00 / $30.0
End-to-end time
15.3s
Better than…

Is GPT-5.5 (medium) on the Pareto frontier, and what beats it?

Off the frontier

No. Grok 4.5 (high) is at least as smart for the same money or less.

Next step up: GPT-5.6 Sol (high), smarter but dearer.

GPT-5.5 (medium) vs Grok 4.5 (high)GPT-5.5 (medium) vs GPT-5.6 Sol (high)
#ModelCreatorIntelligenceTotal costE2E totalOpenReleasedFrontier
1GPT-5.5 (medium)OpenAI50.40$93615.3s2026-04-23
2Grok 4.5 (high)SpaceXAI53.80$60214.0s2026-07-08Frontier
3GPT-5.6 Sol (high)OpenAI55.90$95620.7s2026-07-09Frontier

Open in the picker Daily check URL: 200 on the frontier, 409 once beaten

At a glance

GPT-5.5 (medium) today

Time to first answer7.40s
Output speed64 tok/s
Input modalitiesNot reported
0204060$10$20$50$100$200$500$1k$2k$5k$10kCost to run the Artificial Analysis Intelligence Index (USD, log scale)Intelligence IndexClaude 4.5 Haiku (Reasoning) (Anthropic): intelligence 29.60, $564Claude 4.5 Sonnet (Reasoning) (Anthropic): intelligence 36.40, $1133Claude Opus 4.7 (Adaptive Reasoning, Max Effort) (Anthropic): intelligence 53.50, $3738Claude Opus 4.8 (Adaptive Reasoning, Max Effort) (Anthropic): intelligence 55.70, $3753Claude Sonnet 4.6 (Adaptive Reasoning, Max Effort) (Anthropic): intelligence 47.20, $3356Claude Sonnet 5 (Adaptive Reasoning, Max Effort) (Anthropic): intelligence 53.40, $4010Claude Sonnet 5 (Non-reasoning, High Effort) (Anthropic): intelligence 41.70, $427DeepSeek R1 (Jan '25) (DeepSeek): intelligence 18.50, $416DeepSeek V3 0324 (DeepSeek): intelligence 15.40, $132Gemini 2.5 Pro (Google): intelligence 25.80, $610Gemini 3.1 Flash-Lite (Google): intelligence 25.00, $93.7Gemini 3.1 Pro Preview (Google): intelligence 46.50, $815Gemini 3.5 Flash (high) (Google): intelligence 50.20, $1041Gemma 4 26B A4B (Reasoning) (Google): intelligence 25.70, $51.9Gemma 4 31B (Non-reasoning) (Google): intelligence 21.80, $29.0GLM-4.6 (Reasoning) (Z AI): intelligence 28.70, $313GLM-4.7 (Reasoning) (Z AI): intelligence 33.70, $603GLM-5.1 (Reasoning) (Z AI): intelligence 40.20, $659GLM-5.2 (max) (Z AI): intelligence 51.10, $925GPT-4.1 mini (OpenAI): intelligence 14.80, $74.7GPT-4.1 nano (OpenAI): intelligence 9.60, $48.7GPT-5 (high) (OpenAI): intelligence 34.70, $813GPT-5.4 (xhigh) (OpenAI): intelligence 51.40, $2132GPT-5.4 mini (xhigh) (OpenAI): intelligence 40.00, $1095GPT-5.5 Instant (June 2026) (OpenAI): intelligence 28.90, $528GPT-5.6 Luna (low) (OpenAI): intelligence 33.30, $68.8GPT-5.6 Luna (max) (OpenAI): intelligence 51.20, $870GPT-5.6 Luna (medium) (OpenAI): intelligence 38.10, $106GPT-5.6 Luna (Non-reasoning) (OpenAI): intelligence 26.60, $51.4GPT-5.6 Luna (xhigh) (OpenAI): intelligence 49.10, $479GPT-5.6 Sol (Non-reasoning) (OpenAI): intelligence 41.20, $242GPT-5.6 Terra (high) (OpenAI): intelligence 49.00, $496GPT-5.6 Terra (low) (OpenAI): intelligence 40.50, $161GPT-5.6 Terra (max) (OpenAI): intelligence 55.00, $1754GPT-5.6 Terra (xhigh) (OpenAI): intelligence 51.60, $740gpt-oss-120b (high) (OpenAI): intelligence 23.80, $96.3gpt-oss-20b (high) (OpenAI): intelligence 14.90, $29.9Grok 4.3 (high) (SpaceXAI): intelligence 37.60, $288Grok 4.3 (Non-reasoning) (SpaceXAI): intelligence 24.80, $201Grok Build 0.1 0616 (SpaceXAI): intelligence 39.80, $375HyperNova 60B 2605 (Multiverse Computing): intelligence 17.80, $35.0Kimi K3 (Kimi): intelligence 57.10, $2691Llama 3.3 Instruct 70B (Meta): intelligence 9.40, $78.0Llama 4 Maverick (Meta): intelligence 14.30, $38.2Magistral Medium 1.2 (Mistral): intelligence 17.90, $886Ministral 3 14B (Mistral): intelligence 11.10, $120Ministral 3 3B (Mistral): intelligence 6.80, $91.8Ministral 3 8B (Mistral): intelligence 9.00, $113Mistral Large 3 (Mistral): intelligence 15.90, $71.0Mistral Medium 3.1 (Mistral): intelligence 14.70, $132Mistral Medium 3.5 (Mistral): intelligence 29.90, $1483Mistral Small 3.1 (Mistral): intelligence 14.70, $29.9Mistral Small 3.2 (Mistral): intelligence 10.60, $128Nemotron 3 Ultra 550B A55B (Reasoning) (NVIDIA): intelligence 37.80, $435Nova 2.0 Lite (high) (Amazon): intelligence 18.20, $635Nova 2.0 Pro Preview (low) (Amazon): intelligence 19.60, $244Nova 2.0 Pro Preview (medium) (Amazon): intelligence 21.80, $407Nova 2.0 Pro Preview (Non-reasoning) (Amazon): intelligence 14.40, $206NVIDIA Nemotron 3 Nano 30B A3B (Reasoning) (NVIDIA): intelligence 14.20, $38.9NVIDIA Nemotron 3 Super 120B A12B (Reasoning) (NVIDIA): intelligence 25.40, $254Qwen3 30B A3B 2507 (Reasoning) (Alibaba): intelligence 14.40, $152Qwen3 Coder Next (Alibaba): intelligence 21.10, $247Qwen3 Next 80B A3B (Reasoning) (Alibaba): intelligence 16.70, $401Qwen3.5 122B A10B (Non-reasoning) (Alibaba): intelligence 27.60, $216Qwen3.5 122B A10B (Reasoning) (Alibaba): intelligence 32.30, $447Qwen3.5 397B A17B (Reasoning) (Alibaba): intelligence 33.70, $528Qwen3.5 9B (Reasoning) (Alibaba): intelligence 21.40, $179Qwen3.6 27B (Non-reasoning) (Alibaba): intelligence 30.50, $356Qwen3.6 27B (Reasoning) (Alibaba): intelligence 37.10, $668Qwen3.6 35B A3B (Non-reasoning) (Alibaba): intelligence 24.20, $496Qwen3.6 35B A3B (Reasoning) (Alibaba): intelligence 31.60, $334Qwen3.6 Plus (Alibaba): intelligence 39.60, $526Qwen3.7 Max (Alibaba): intelligence 46.00, $1559Qwen3.7 Plus (Alibaba): intelligence 39.00, $303Ring-2.6-1T (InclusionAI): intelligence 30.60, $460Llama 4 Scout (Meta): intelligence 10.00, $11.5DeepSeek V3 (Dec '24) (DeepSeek): intelligence 14.20, $19.8gpt-oss-120b (low) (OpenAI): intelligence 14.90, $24.2MiMo-V2.5 (Xiaomi): intelligence 37.20, $25.2DeepSeek V4 Flash (Reasoning, Max Effort) (DeepSeek): intelligence 40.30, $74.3MiMo-V2.5-Pro (Xiaomi): intelligence 42.20, $98.5DeepSeek V4 Pro (Reasoning, Max Effort) (DeepSeek): intelligence 44.30, $176MiniMax-M3 (MiniMax): intelligence 44.40, $204GPT-5.6 Terra (medium) (OpenAI): intelligence 45.60, $240GPT-5.6 Luna (high) (OpenAI): intelligence 46.10, $275GPT-5.6 Sol (low) (OpenAI): intelligence 49.40, $353Muse Spark 1.1 (xhigh) (Meta): intelligence 50.60, $548GPT-5.6 Sol (medium) (OpenAI): intelligence 53.60, $593Grok 4.5 (high) (SpaceXAI): intelligence 53.80, $602GPT-5.6 Sol (high) (OpenAI): intelligence 55.90, $956GPT-5.6 Sol (xhigh) (OpenAI): intelligence 57.70, $1543GPT-5.6 Sol (max) (OpenAI): intelligence 58.90, $2824Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback) (Anthropic): intelligence 59.90, $5631GPT-5.5 (Non-reasoning) (OpenAI): intelligence 35.40, $211GPT-5.5 (low) (OpenAI): intelligence 43.50, $375GPT-5.5 (high) (OpenAI): intelligence 53.10, $1719GPT-5.5 (xhigh) (OpenAI): intelligence 54.80, $2778GPT-5.5 (medium) (OpenAI): intelligence 50.40, $936GPT-5.5 (medium)(Non-reasoning)(low)(high)(xhigh)Llama 4 ScoutGrok 4.5 (high)GPT-5.6 Sol (high)Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback)
GPT-5.5 (medium)Same release, other effort levelsToday's Pareto frontierEvery other model
Up and left is better. Dotted line: today's Pareto frontier. Hover a point for its numbers, click it for its page.

Intelligence: Artificial Analysis Intelligence Index. Cost: total cost to run that benchmark, so reasoning tokens count. API id: gpt-5-5-medium.

Matchup

Compare head to head

Suggested: what beats it, its effort levels, and frontier models near its price.

Compare GPT-5.5 (medium) with measured models

Release

What the GPT-5.5 release did to the frontier on 2026-04-23

4 of 5 effort levels reached the frontier at launch (GPT-5.5 (low), GPT-5.5 (medium), GPT-5.5 (high), GPT-5.5 (xhigh)). Impact 3.27, #9 of 34 releases this past year.

Release page: launch-day frontier and every effort level

Deciding

Should you use GPT-5.5 (medium)?

Should you use GPT-5.5 (medium)?

Only when it fits your setup: Grok 4.5 (high) is at least as smart for the same money or less, so GPT-5.5 (medium) is off the value frontier today.

What is better and cheaper than GPT-5.5 (medium)?

Grok 4.5 (high) — at least as smart for the same money or less.

How much does GPT-5.5 (medium) cost?

$5.00/$30 in/out per 1M tokens, and $936 to run the full Artificial Analysis Intelligence Index, the honest all-in number for reasoning models.

Is GPT-5.5 (medium) on the Pareto frontier?

No: Grok 4.5 (high) beats it on intelligence, cost, or both.

Frontier membership by axis pair

Other axis pairs where GPT-5.5 (medium) is Pareto-optimal.

Y axisX axisOn the frontier
AA intelligence indexAA total cost to run (USD)
AA intelligence indexEnd-to-end total seconds
AA intelligence indexOutput speed tokens/sec
Agents: Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/models/gpt-5-5-medium · Markdown: /api/v1/models/gpt-5-5-medium?format=md · llms.txt · agent skill