Identity
- Status
- active
- Developer ID
gpt-5.1- Released
- Nov 13, 2025
- Version
- GPT-5.1
- License
- Unknown
OpenAIGPT-5.1
GPT-5.1 is an OpenAI reasoning model for coding and agentic tasks.
- Token context
- 400K tokens
- Inputs
- Text, Image
- Outputs
- Text
- Released
- Nov 13, 2025
Providers & Pricing
Estimate workload cost →| Provider | Input / 1M | Output / 1M | Cache read / 1M | Cache write / 1M | Observed | Evidence |
|---|---|---|---|---|---|---|
OpenaiAvailable | $1.25 | $10.00 | $0.125 | — | Sep 3, 2026 | Provider-reported |
 OpenrouterAvailable | $1.25 | $10.00 | $0.125 | — | Oct 20, 2026 | Provider-reported |
Benchmarks
All benchmark results →| ARC-AGI-1verified-v1-302d8267c052 | 72.83 | — | — | GPT-5.1 (Thinking, High)unknown | Original sourcewinner eligible | Third-party benchmark |
| ARC-AGI-2verified-v2-bca68e12cc9a | 17.64 | — | — | GPT-5.1 (Thinking, High)unknown | Original sourcewinner eligible | Third-party benchmark |
| LMArena Document Arenadocument-2026-09-13-a64ca3b12b6e | 1,403.17 | — | 8,244 | gpt-5.1; 95% CI [1393.82886201, 1412.50542979]; votes 8244; rank 42unknown | Original sourcewinner eligible | Third-party benchmark |
| LMArena Search Arenasearch-2026-10-13-a64ca3b12b6e | 1,199.70 | — | 63,042 | gpt-5.1-search; 95% CI [1194.51255947, 1204.89089087]; votes 63042; rank 20unknown | Original sourcewinner eligible | Third-party benchmark |
| LMArena Text Arenatext-2026-10-15-a64ca3b12b6e | 1,442.74 | — | 41,651 | gpt-5.1-high; 95% CI [1439.06360530, 1446.41090056]; votes 41651; rank 68unknown | Original sourcewinner eligible | Third-party benchmark |
| LMArena Text Arenatext-2026-10-15-a64ca3b12b6e | 1,422.28 | — | 44,434 | gpt-5.1; 95% CI [1418.72432020, 1425.83291138]; votes 44434; rank 110unknown | Original sourcewinner eligible | Third-party benchmark |
| LMArena Vision Arenavision-2026-10-09-a64ca3b12b6e | 1,249.84 | — | 9,861 | gpt-5.1-high; 95% CI [1242.04728848, 1257.64065919]; votes 9861; rank 63unknown | Original sourcewinner eligible | Third-party benchmark |
| LMArena Vision Arenavision-2026-10-09-a64ca3b12b6e | 1,234.81 | — | 10,818 | gpt-5.1; 95% CI [1227.28917044, 1242.33289013]; votes 10818; rank 76unknown | Original sourcewinner eligible | Third-party benchmark |
At a Glance
Model Facts
Capacity
- Token context
- 400K tokens
- Maximum output
- 128K tokens
- Total parameters
- Unknown
- Active parameters
- Unknown
- Knowledge cutoff
- Sep 30, 2024
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 developer model product. Dated API snapshots, serving endpoints, pricing, regions, quantizations, and service tiers attach as versioned aliases or provider details and never create duplicate public model records.
Version Lineage
PredecessorUnknown
SuccessorsUnknown
Aliasesgpt-5.1, gpt-5.1-2025-11-13
Explicit Unknowns
- Architecture
- Tokenizer
Primary Evidence
Sources and Observation Date
Comparable Peers
Related Model Comparisons
| A | Pair | B | Context |
|---|---|---|---|
GPT-5.1OpenAI | vs | Claude Sonnet 4.5Anthropic | cross-developer peersimage, text |
GPT-5.1OpenAI | vs | Seed 2.1 TurboByteDance Seed | cross-developer peersimage, text |
GPT-5.1OpenAI | vs |  Gemini 3.5 Flash LiteGoogle DeepMind | cross-developer peerstext |
GPT-5.1OpenAI | vs | Gemini 3.6 FlashGoogle DeepMind | cross-developer peerstext |
GPT-5.1OpenAI | vs | Gemini 3.7 FlashGoogle DeepMind | cross-developer peerstext |
GPT-5.1OpenAI | vs | GPT-5.2OpenAI | family variantsimage, text |
GPT-5.1OpenAI | vs | GPT-5.2 ProOpenAI | family variantsimage, text |
GPT-5.1OpenAI | vs | GPT-5.5OpenAI | family variantsimage, text |
GPT-5.1OpenAI | vs |  Qwen3 VL PlusQwen | cross-developer peersimage, text |
GPT-5.1OpenAI | vs | cross-developer peersimage, text | |
GPT-5.1OpenAI | vs | Grok 4.5xAI | cross-developer peersimage, text |
Questions
GPT-5.1 FAQs
What is GPT-5.1?+
GPT-5.1 is an OpenAI reasoning model for coding and agentic tasks. It is developed by OpenAI and its current sourced lifecycle status is active.
What inputs and outputs does GPT-5.1 support?+
GPT-5.1's current record lists Text and Image as input and Text as output.
How much context does GPT-5.1 support?+
The current record lists a 400K-token context window and a maximum output of 128K tokens.
Is GPT-5.1 available through an API?+
GPT-5.1 is marked as API-available. The directly sourced provider records currently include Openai and Openrouter.
How much does GPT-5.1 cost through an API?+
The lowest directly sourced prices currently attached to GPT-5.1 are $1.25 per million input tokens through Openai and $10.00 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-5.1 support?+
GPT-5.1's recorded capabilities are chat, generation, reasoning, structured outputs, and tools. Its supported tasks are image, reasoning, and text.
Can GPT-5.1 be self-hosted?+
GPT-5.1 is not marked as an open-weight model. Self-hosting is marked as unsupported, with no license recorded.
Does GPT-5.1 have related versions or aliases?+
No predecessor is recorded. No successor is recorded. Recorded aliases are gpt-5.1 and gpt-5.1-2025-11-13.
Which models can GPT-5.1 be compared with?+
The current compatible peer set includes Claude Sonnet 4.5, Seed 2.1 Turbo, Gemini 3.5 Flash Lite, Gemini 3.6 Flash, and Gemini 3.7 Flash. Compatibility requires shared sourced modalities and tasks; it does not imply that one model is better. Browse model comparisons →
How current is the Model Markets record for GPT-5.1?+
GPT-5.1 was last verified Sep 3, 2026 from OpenAI's primary source, “GPT-5.1 Model | OpenAI API.” The evidence is classified as official fact.