Identity
- Status
- active
- Developer ID
o3- Released
- Apr 16, 2025
- Version
- o3
- License
- Unknown
OpenAIo3
o3 is OpenAI's reasoning model for complex tasks, succeeded as the default choice by GPT-5.
- Token context
- 200K tokens
- Inputs
- Text, Image
- Outputs
- Text
- Released
- Apr 16, 2025
Providers & Pricing
Estimate workload cost →| Provider | Input / 1M | Output / 1M | Cache read / 1M | Cache write / 1M | Observed | Evidence |
|---|---|---|---|---|---|---|
OpenaiAvailable | $2.00 | $8.00 | $0.50 | — | Sep 3, 2026 | Provider-reported |
 OpenrouterAvailable | $2.00 | $8.00 | $0.50 | — | Oct 20, 2026 | Provider-reported |
OpenrouterAvailable | $1.00 | $4.00 | $0.25 | — | Sep 3, 2026 | Provider-reported |
At a Glance
Model Facts
Capacity
- Token context
- 200K tokens
- Maximum output
- 100K tokens
- Total parameters
- Unknown
- Active parameters
- Unknown
- Knowledge cutoff
- Jun 1, 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
Aliaseso3, o3-2025-04-16
Explicit Unknowns
- Architecture
- Tokenizer
Primary Evidence
Sources and Observation Date
Comparable Peers
Related Model Comparisons
| A | Pair | B | Context |
|---|---|---|---|
o3OpenAI | vs |  Solar Pro 4Upstage | cross-developer peerstext |
o3OpenAI | vs | cross-developer peersimage, text | |
o3OpenAI | vs | Claude Haiku 4.5Anthropic | cross-developer peersimage, text |
o3OpenAI | vs | Claude Opus 4.5Anthropic | cross-developer peersimage, text |
o3OpenAI | vs | Claude Sonnet 4.5Anthropic | cross-developer peersimage, text |
o3OpenAI | vs |  ERNIE X1.1Baidu | cross-developer peerstext |
o3OpenAI | vs |  Gemma 4 E2BGoogle DeepMind | cross-developer peersimage, text |
o3OpenAI | vs | Gemma 4 E4BGoogle DeepMind | cross-developer peersimage, text |
o3OpenAI | vs | cross-developer peerstext | |
o3OpenAI | vs |  Pixtral LargeMistral AI | cross-developer peersimage, text |
o3OpenAI | vs | o3-proOpenAI | family variantsimage, text |
o3OpenAI | vs |  Qwen3 VL FlashQwen | cross-developer peersimage, text |
Questions
o3 FAQs
What is o3?+
o3 is OpenAI's reasoning model for complex tasks, succeeded as the default choice by GPT-5. It is developed by OpenAI and its current sourced lifecycle status is active.
What inputs and outputs does o3 support?+
o3's current record lists Text and Image as input and Text as output.
How much context does o3 support?+
The current record lists a 200K-token context window and a maximum output of 100K tokens.
Is o3 available through an API?+
o3 is marked as API-available. The directly sourced provider records currently include Openai and Openrouter.
How much does o3 cost through an API?+
The lowest directly sourced prices currently attached to o3 are $1.00 per million input tokens through Openrouter and $4.00 per million output tokens through Openrouter. Prices are provider-specific and should be checked against each cited observation date.
What capabilities and tasks does o3 support?+
o3's recorded capabilities are chat, generation, reasoning, structured outputs, and tools. Its supported tasks are image, reasoning, and text.
Can o3 be self-hosted?+
o3 is not marked as an open-weight model. Self-hosting is marked as unsupported, with no license recorded.
Does o3 have related versions or aliases?+
No predecessor is recorded. No successor is recorded. Recorded aliases are o3 and o3-2025-04-16.
Which models can o3 be compared with?+
The current compatible peer set includes Solar Pro 4, Grok Build 0.1, Claude Haiku 4.5, Claude Opus 4.5, and Claude Sonnet 4.5. 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 o3?+
o3 was last verified Sep 3, 2026 from OpenAI's primary source, “o3 Model | OpenAI API.” The evidence is classified as official fact.