Question 1

What is o3?

Accepted Answer

o3 is a model from OpenAI, released on Apr 16, 2025. o3 is a well-rounded and powerful model across domains. It sets a new standard for math, science, coding, and visual reasoning tasks. It also excels at technical writing and instruction-following. Use it to think through multi-step problems that involve analysis across text, code, and images.

Question 2

How much does o3 cost?

Accepted Answer

On the Respan gateway, input starts at $2.00 per 1M tokens on every provider, and output starts at $8.00 per 1M tokens on every provider, after gateway discounts. Averaged across 4 providers, it costs $4.00 per 1M input tokens and $16.00 per 1M output tokens.

Question 3

Which providers serve o3 on Respan?

Accepted Answer

4 providers serve o3: Azure OpenAI, OpenAI, and OpenRouter. Azure OpenAI requires your own provider API key (BYOK).

Question 4

What is o3's context window?

Accepted Answer

o3 accepts up to 200K tokens of context on its largest provider route.

Question 5

How do I use o3 with the Respan gateway?

Accepted Answer

Point any OpenAI-compatible SDK at https://api.respan.ai/api/ with your Respan API key and set the model to "openai/o3-2025-04-16". To set it up with a coding agent, copy the agent setup prompt at the top of this page.

Question 6

How fast is o3?

Accepted Answer

Over the last 30 days of requests through the Respan gateway, the fastest provider was OpenAI at 48 tokens per second, and the lowest response latency was 0.7 seconds on OpenAI. Speed varies with request size and provider.

Question 7

Where does o3 rank on the Respan Index?

Accepted Answer

o3 scores 23.9 out of 100 on the Respan Index v1.1, ranking #86 of 138 models. By category: Coding 7.9, Agents 9.1, Reasoning 30.3, Knowledge & language 49.3, and Human preference 47.8. The Respan Index combines independent and lab-reported benchmark results into one score, using benchmark data collected by llmmetric.com.

Question 8

How does o3 score on benchmarks?

Accepted Answer

o3 has 19 published benchmark scores, including SWE-bench Verified 69.1%, OSWorld-Verified 23%, and GPQA Diamond 81.8%. Each score links to where it was published; the data is collected by llmmetric.com.

Provider	Context	Input	Output
Azure OpenAIBYOK only`azure/o3`	200K	$2.00/M	$8.00/M
OpenAI`openai/o3`	200K	$2.00/M	$8.00/M
OpenRouter`openrouter/openai/o3`	200K	$2.00/M	$8.00/M
OpenAI`openai/o3-2025-04-16`	200K	$10.00/M	$40.00/M

o3

Providers

Certified where it counts.

Pricing

Cost by volume

Throughput and latency

Output speed

Response latency

Benchmarks

Respan Indexv1.1

Coding4

Apps

o3 FAQ

Works with your entire stack

Built for AI agents.
Break less.
Ship more.

Agents1

Reasoning4

Math5

Knowledge2

Arena2

Other1

o3