Identity
- Status
- active
- Developer ID
gpt-5.5-2026-04-23- Released
- Apr 23, 2026
- Version
- GPT-5.5
- License
- Unknown
OpenAIGPT-5.5
GPT-5.5 is OpenAI's prior frontier model for coding, tool-heavy agents, long-context retrieval, and professional knowledge work.
- Context
- 1,050,000 tokens
- Inputs
- Text, Image
- Outputs
- Text
- Released
- Apr 23, 2026
Benchmark Market Position
Quality, Cost, and Position
Efficiency FrontierLiveBench overall · output estimate
Expand →Cost, RankedScore-adjusted output estimate · lowest first
Expand →- 1Grok Build 0.1$0.0028
- 2DeepSeek-V4-Flash$0.0086
- 3GLM-5.3-Flash$0.012
- 4MiniMax-M3$0.024
- 5GPT-5.6 Luna (max)$0.034
- 6Grok 4.3$0.040
- 7Gemini 3.5 Flash-Lite (high)$0.043
- 8DeepSeek-V4-Flash-Vision-Exp$0.044
- 9DeepSeek-V4-Pro$0.070
- 10Gemini 3.6 Flash (high)$0.071
- 11GLM-5.2$0.073
- 12GPT-5.4 Nano (extra high)$0.077
- 13Grok 4.5$0.079
- 14Qwen3.8-27B$0.094
- 15Gemini 3.7 Flash (high)$0.102
- 16Grok 4.6$0.118
- 17Kimi-K2.6$0.127
- 18Qwen3.8-Max$0.131
- 19GPT-5.6 Sol (max)$0.138
- 20Gemini 3.5 Flash (high)$0.177
- 21Gemini 3.1 Pro (high)$0.197
- 22GPT-5.2 (high)$0.203
- 23Kimi-K3$0.240
- 24Claude Sonnet 4.6$0.257
- 25Claude Opus 4.6$0.307
- 26GPT-5.4 Mini (extra high)$0.307
- 27GLM-5.3$0.314
- 28GPT-5.6 Terra (max)$0.323
- 29GPT-5.4 (extra high)$0.333
- 30Claude Opus 4.7$0.354
- 31GPT-5.5 (extra high)$0.403
- 32Claude Opus 5$0.444
- 33Claude Opus 4.5$0.491
- 34Claude Opus 4.8$0.744
- 35Claude Fable 5$1.17
The outlined observation is GPT-5.5. Cost views require publisher-reported LiveBench output tokens and a current sourced USD output-token rate; models missing either input are omitted.
Providers & Pricing
Estimate workload cost →| Provider | Input / 1M | Output / 1M | Cache read / 1M | Cache write / 1M | Observed | Evidence |
|---|---|---|---|---|---|---|
OpenaiAvailable | $5.00 | $30.00 | $0.50 | — | Sep 3, 2026 | Provider-reported |
Benchmarks
All benchmark results →| ARC-AGI-1verified-v1-b2e2a31b3d53 | 95.00 | — | — | GPT-5.5 (XHigh)unknown | Original sourcewinner eligible | Third-party benchmark |
| ARC-AGI-2verified-v2-326661568d5f | 85.00 | — | — | GPT-5.5 (XHigh)unknown | Original sourcewinner eligible | Third-party benchmark |
| LiveBench2026-06-25 | 84.54 | 11,355 | 1,270 | gpt-5.5-xhighaverage per case | Recomputedwinner eligible | Third-party benchmark |
| LMArena Agent Arenaagent-2026-08-31-011508720696 | 7.89 | — | 50,040 | GPT 5.5 (xHigh); 95% CI [6.81615311, 8.96269497]; sessions 50040; observations 2230540; rank 7unknown | Original sourcewinner eligible | Third-party benchmark |
| LMArena Agent Arenaagent-2026-08-31-011508720696 | 6.10 | — | 73,880 | GPT 5.5 (High); 95% CI [5.09147872, 7.09988726]; sessions 73880; observations 2269239; rank 11unknown | Original sourcewinner eligible | Third-party benchmark |
| LMArena Agent Arenaagent-2026-08-31-011508720696 | 4.84 | — | 77,762 | GPT 5.5; 95% CI [3.96340788, 5.71819765]; sessions 77762; observations 1908513; rank 18unknown | Original sourcewinner eligible | Third-party benchmark |
| LMArena Document Arenadocument-2026-07-30-011508720696 | 1,484.70 | — | 16,816 | gpt-5.5-high; 95% CI [1477.69349247, 1491.71461103]; votes 16816; rank 7unknown | Original sourcewinner eligible | Third-party benchmark |
| LMArena Document Arenadocument-2026-07-30-011508720696 | 1,480.30 | — | 17,286 | gpt-5.5; 95% CI [1473.46488383, 1487.13183487]; votes 17286; rank 9unknown | Original sourcewinner eligible | Third-party benchmark |
| LMArena Search Arenasearch-2026-08-24-011508720696 | 1,242.05 | — | 89,873 | gpt-5.5-search; 95% CI [1236.73488085, 1247.37053078]; votes 89873; rank 3unknown | Original sourcewinner eligible | Third-party benchmark |
| LMArena Text Arenatext-2026-09-01-011508720696 | 1,471.56 | — | 63,265 | gpt-5.5-high; 95% CI [1467.73328730, 1475.37792479]; votes 63265; rank 21unknown | Original sourcewinner eligible | Third-party benchmark |
| LMArena Text Arenatext-2026-09-01-011508720696 | 1,466.80 | — | 64,686 | gpt-5.5; 95% CI [1462.99653821, 1470.60035247]; votes 64686; rank 27unknown | Original sourcewinner eligible | Third-party benchmark |
| LMArena Vision Arenavision-2026-08-27-011508720696 | 1,296.36 | — | 21,389 | gpt-5.5; 95% CI [1289.71672285, 1302.99355267]; votes 21389; rank 16unknown | Original sourcewinner eligible | Third-party benchmark |
| LMArena Vision Arenavision-2026-08-27-011508720696 | 1,294.36 | — | 20,121 | gpt-5.5-high; 95% CI [1287.65516407, 1301.05910249]; votes 20121; rank 18unknown | Original sourcewinner eligible | Third-party benchmark |
| ToneBench2026-08-28-10-task-cd9819ab6e4d | 82.80 | 3,517 | 50 | GPT-5.5 (high)average per case | Original sourcewinner eligible | Third-party benchmark |
| ToneBench2026-08-28-10-task-cd9819ab6e4d | 82.60 | 3,517 | 50 | GPT-5.5 (xhigh)average per case | Original sourcewinner eligible | Third-party benchmark |
| ToneBench2026-08-28-10-task-cd9819ab6e4d | 82.00 | 3,629 | 50 | GPT-5.5 (default)average per case | Original sourcewinner eligible | Third-party benchmark |
| ToneBench2026-08-28-10-task-cd9819ab6e4d | 81.53 | 3,805 | 50 | GPT-5.5 (none)average per case | Original sourcewinner eligible | Third-party benchmark |
At a Glance
Model Facts
Capacity
- Context
- 1,050,000 tokens
- Maximum output
- 128,000 tokens
- Total parameters
- Unknown
- Active parameters
- Unknown
- Knowledge cutoff
- Dec 1, 2025
Interface and Access
- Inputs
- Text, Image
- Outputs
- Text
- API available
- Yes
- Open weights
- No
- Self-hostable
- No
- Reasoning
- Yes
- Vision
- Yes
- Tool calling
- Yes
- Capabilities
- chat, generation, reasoning, structured outputs, tools
This page represents one immutable developer model ID. Serving endpoints, pricing, regions, quantizations, and service tiers attach separately and never create duplicate model records.
Version Lineage
PredecessorUnknown
SuccessorsUnknown
Aliasesgpt-5.5, gpt-5.5-2026-04-23
Explicit Unknowns
- Architecture
- Tokenizer
Primary Evidence
Sources and Observation Date
Comparable Peers
Related Model Comparisons
No Eligible Peers YetComparisons require a shared sourced modality, workload, and enough material differences.
Questions
GPT-5.5 FAQs
What is GPT-5.5?+
GPT-5.5 is OpenAI's prior frontier model for coding, tool-heavy agents, long-context retrieval, and professional knowledge work. It is developed by OpenAI and its current sourced lifecycle status is active.
What inputs and outputs does GPT-5.5 support?+
GPT-5.5's current record lists Text and Image as input and Text as output.
How much context does GPT-5.5 support?+
The current record lists a 1,050,000-token context window and a maximum output of 128,000 tokens.
Is GPT-5.5 available through an API?+
GPT-5.5 is marked as API-available. The directly sourced provider records currently include Openai.
How much does GPT-5.5 cost through an API?+
The lowest directly sourced prices currently attached to GPT-5.5 are $5.00 per million input tokens through Openai and $30.00 per million output tokens through Openai. Prices are provider-specific and should be checked against each cited observation date.
What capabilities and tasks does GPT-5.5 support?+
GPT-5.5's recorded capabilities are chat, generation, reasoning, structured outputs, and tools. Its supported tasks are image, reasoning, and text.
Can GPT-5.5 be self-hosted?+
GPT-5.5 is not marked as an open-weight model. Self-hosting is marked as unsupported, with no license recorded.
Does GPT-5.5 have related versions or aliases?+
No predecessor is recorded. No successor is recorded. Recorded aliases are gpt-5.5 and gpt-5.5-2026-04-23.
How current is the Model Markets record for GPT-5.5?+
GPT-5.5 was last verified Sep 3, 2026 from OpenAI's primary source, “GPT-5.5 Model | OpenAI API.” The evidence is classified as official fact.