o3 answered 58 of 80 questions correctly (72.5%) in our 2026-10-27 run, ranking #21 of 78 models.

o3 generated a median of 163 output tokens per second in our 2026-10-27 run, ranking #14 of 78. Median time to first token was 1.2 s.

What is the latency of o3?

o3 had a median time to first token of 1.2 s in our 2026-10-27 run, ranking #53 of 78 models.

How much does o3 cost?

o3 cost $0.0088 per question on average as billed in our 2026-10-27 run, reasoning tokens included.

What is o3 API pricing?

o3 is listed at $2 per million input tokens and $8 per million output tokens on OpenRouter.

What is the context window of o3?

o3 accepts up to 200,000 tokens of context, according to OpenRouter's model catalogue.

o3 is made by OpenAI. We tested it through OpenRouter using the model ID openai/o3.

Where can I use o3 via API?

Through OpenRouter, o3 is served by 1 host: OpenAI.

OpenAIReleased 16 Apr 2025

o3 benchmarks, speed and API pricing

Reviewed by LLM Verifications team · Tested 27 Oct 2026

Compare

Available through OpenRouter on

OpenAI$2 in · $8 out

Intelligence72.5% correct#21 of 72

Speed163tok/s#14 of 72

Cost$0.0088per question#57 of 72List $2 in · $8 out per 1M

Verbosity1,025tokens per question#34 of 72

Summary

Answers 58 of 80 verification questions correctly (72.5%), placing #21 of 72 models tested on the current suite.
Generates 163 output tokens per second, faster than 82% of the models we measure.
Starts responding after 1.2 s (median time to first token), including thinking time.
Costs $0.0088 per question as billed, #16 cheapest of 31 models priced over $1 per 1M tokens.

Specifications

Reasoning: Yes
Input: image, text, file
Output: text
Context window: 200k tokens
Weights: —
Knowledge cutoff: 30 Jun 2024
OpenRouter ID: openai/o3
Last tested: 27 Oct 2026

Peer group: 34 models with a blended list price over $1 per 1M tokens (3 input : 1 output). Charts below compare o3 with all models; cost and speed charts focus on this peer group.

Intelligence

Verification score: the share of 80 questions from open datasets answered correctly. See the benchmark datasets.

Score vs. cost per question

o3 circled; dashed line joins models no cheaper model beats

Score vs. end-to-end response time

o3 circled · accurate and quick sits top left

Score vs. tokens per question

o3 circled · output tokens, reasoning included

Verification score

All models tested on the current suite

61 more models · see the full leaderboard

Cost

Average cost of one question, split into input, reasoning and answer tokens at each model's list price. Reasoning tokens are billed as output.

Cost per question, by token type

Peer group: blended price over $1

Input Reasoning Answer

Cost per question, as billed

All models · lower is better

1Granite 4.0 Micro$0.000051
2gpt-oss-20b$0.000066
3Granite 4.2 8B$0.000077
4Nova Micro 1.0$0.000087
5Mercury 2.5$0.00011
6Phi 4$0.00012
7gpt-oss-120b$0.00013
8GLM 5.3 Flash$0.00015
9Ministral 3 3B 2512$0.00019
10GPT-6 Luna$0.00025
57o3$0.0088

61 more models · see the full leaderboard

Speed and latency

Median of 3 streamed runs of the same prompt, measured 25 Oct 2026.

Output speed

Peer group (over $1) · higher is better

19 more models · see the full leaderboard

Time to first token

Peer group (over $1) · lower is better

20 more models · see the full leaderboard

End-to-end response time

Peer group (over $1) · lower is better

21 more models · see the full leaderboard

Latency vs. output speed

o3 circled · quick to start and fast sits top left

Results by category

Questions answered correctly in each category

Science23/30

Engineering8/15

Medicine7/11

Economics7/9

Law5/6

Humanities & social science8/9

More from OpenAI

OpenAI#3GPT-5.3-Codex82.5% verification score95 tok/s1.4 s first token$0.01 / question

OpenAI#12GPT-6 Astra76.2% verification score49 tok/s1.3 s first token$0.013 / question

OpenAI#12GPT-6.1 Terra Pro76.2% verification score— tok/s8.5 s first token$0.005 / question

All OpenAI models →

Compare o3

Head to head with its closest rivals, other OpenAI models and the top models overall.

Hosts and prices

Every host serving this model through OpenRouter, from OpenRouter's catalogue

Host	Input / 1M	Output / 1M	Context	Max output	Quantization
OpenAI	$2	$8	200k	100k	—

Sources

Scores, speed and billed cost are our own measurements. Prices, context window and hosts come from OpenRouter's catalogue on the test date.

o3 on OpenRouter: list prices and hosts
SuperGPQA (paper): 50 of the questions, ODC-BY 1.0
MMLU-Pro (paper): 30 of the questions, MIT
OpenRouter generation records: where billed cost and native token counts come from
Our methodology and editorial standards

o3: frequently asked questions

How accurate is o3?: o3 answered 58 of 80 questions correctly (72.5%) in our 2026-10-27 run, ranking #21 of 78 models.
How fast is o3?: o3 generated a median of 163 output tokens per second in our 2026-10-27 run, ranking #14 of 78. Median time to first token was 1.2 s.
What is the latency of o3?: o3 had a median time to first token of 1.2 s in our 2026-10-27 run, ranking #53 of 78 models.
How much does o3 cost?: o3 cost $0.0088 per question on average as billed in our 2026-10-27 run, reasoning tokens included.
What is o3 API pricing?: o3 is listed at $2 per million input tokens and $8 per million output tokens on OpenRouter.
What is the context window of o3?: o3 accepts up to 200,000 tokens of context, according to OpenRouter's model catalogue.
Who makes o3?: o3 is made by OpenAI. We tested it through OpenRouter using the model ID openai/o3.
Where can I use o3 via API?: Through OpenRouter, o3 is served by 1 host: OpenAI.

OpenAIReleased 16 Apr 2025

o3 benchmarks, speed and API pricing

Reviewed by LLM Verifications team · Tested 27 Oct 2026

Compare

Available through OpenRouter on

OpenAI$2 in · $8 out

Intelligence72.5% correct#21 of 72

Speed163tok/s#14 of 72

Cost$0.0088per question#57 of 72List $2 in · $8 out per 1M

Verbosity1,025tokens per question#34 of 72

Summary

Answers 58 of 80 verification questions correctly (72.5%), placing #21 of 72 models tested on the current suite.
Generates 163 output tokens per second, faster than 82% of the models we measure.
Starts responding after 1.2 s (median time to first token), including thinking time.
Costs $0.0088 per question as billed, #16 cheapest of 31 models priced over $1 per 1M tokens.

Specifications

Reasoning: Yes
Input: image, text, file
Output: text
Context window: 200k tokens
Weights: —
Knowledge cutoff: 30 Jun 2024
OpenRouter ID: openai/o3
Last tested: 27 Oct 2026

Peer group: 34 models with a blended list price over $1 per 1M tokens (3 input : 1 output). Charts below compare o3 with all models; cost and speed charts focus on this peer group.

Intelligence

Verification score: the share of 80 questions from open datasets answered correctly. See the benchmark datasets.

Score vs. cost per question

o3 circled; dashed line joins models no cheaper model beats

Score vs. end-to-end response time

o3 circled · accurate and quick sits top left

Score vs. tokens per question

o3 circled · output tokens, reasoning included

Verification score

All models tested on the current suite

61 more models · see the full leaderboard

Cost

Average cost of one question, split into input, reasoning and answer tokens at each model's list price. Reasoning tokens are billed as output.

Cost per question, by token type

Peer group: blended price over $1

Input Reasoning Answer

Cost per question, as billed

All models · lower is better

1Granite 4.0 Micro$0.000051
2gpt-oss-20b$0.000066
3Granite 4.2 8B$0.000077
4Nova Micro 1.0$0.000087
5Mercury 2.5$0.00011
6Phi 4$0.00012
7gpt-oss-120b$0.00013
8GLM 5.3 Flash$0.00015
9Ministral 3 3B 2512$0.00019
10GPT-6 Luna$0.00025
57o3$0.0088

61 more models · see the full leaderboard

Speed and latency

Median of 3 streamed runs of the same prompt, measured 25 Oct 2026.

Output speed

Peer group (over $1) · higher is better

19 more models · see the full leaderboard

Time to first token

Peer group (over $1) · lower is better

20 more models · see the full leaderboard

End-to-end response time

Peer group (over $1) · lower is better

21 more models · see the full leaderboard

Latency vs. output speed

o3 circled · quick to start and fast sits top left

Results by category

Questions answered correctly in each category

Science23/30

Engineering8/15

Medicine7/11

Economics7/9

Law5/6

Humanities & social science8/9

More from OpenAI

OpenAI#3GPT-5.3-Codex82.5% verification score95 tok/s1.4 s first token$0.01 / question

OpenAI#12GPT-6 Astra76.2% verification score49 tok/s1.3 s first token$0.013 / question

OpenAI#12GPT-6.1 Terra Pro76.2% verification score— tok/s8.5 s first token$0.005 / question

All OpenAI models →

Compare o3

Head to head with its closest rivals, other OpenAI models and the top models overall.

Hosts and prices

Every host serving this model through OpenRouter, from OpenRouter's catalogue

Host	Input / 1M	Output / 1M	Context	Max output	Quantization
OpenAI	$2	$8	200k	100k	—

Sources

Scores, speed and billed cost are our own measurements. Prices, context window and hosts come from OpenRouter's catalogue on the test date.

o3 on OpenRouter: list prices and hosts
SuperGPQA (paper): 50 of the questions, ODC-BY 1.0
MMLU-Pro (paper): 30 of the questions, MIT
OpenRouter generation records: where billed cost and native token counts come from
Our methodology and editorial standards

o3: frequently asked questions

How accurate is o3?: o3 answered 58 of 80 questions correctly (72.5%) in our 2026-10-27 run, ranking #21 of 78 models.
How fast is o3?: o3 generated a median of 163 output tokens per second in our 2026-10-27 run, ranking #14 of 78. Median time to first token was 1.2 s.
What is the latency of o3?: o3 had a median time to first token of 1.2 s in our 2026-10-27 run, ranking #53 of 78 models.
How much does o3 cost?: o3 cost $0.0088 per question on average as billed in our 2026-10-27 run, reasoning tokens included.
What is o3 API pricing?: o3 is listed at $2 per million input tokens and $8 per million output tokens on OpenRouter.
What is the context window of o3?: o3 accepts up to 200,000 tokens of context, according to OpenRouter's model catalogue.
Who makes o3?: o3 is made by OpenAI. We tested it through OpenRouter using the model ID openai/o3.
Where can I use o3 via API?: Through OpenRouter, o3 is served by 1 host: OpenAI.