o3 retirement date: December 11, 2026
o3 shuts down on December 11, 2026 (announced Jun 11, 2026).
- Provider
- OpenAI
- Model IDs affected
o3,o3-2025-04-16- Announced
- June 11, 2026
- Shutdown date
- December 11, 2026
- Replacement
- gpt-5.6-sol
- Platforms
- Dates apply to the OpenAI API. Fine-tuned models follow the same shutdown schedule as their base model. If you use OpenAI models through another platform, check that platform's own retirement schedule.
- Source
- Official OpenAI deprecations page (data last changed 2026-11-02, re-checked daily)
o3 vs GPT-5.6 Sol: price and limits
| o3 | GPT-5.6 Sol | Change | |
|---|---|---|---|
| Context window (tokens) | 200,000 | 1,050,000 | +425% |
| Max output (tokens) | 100,000 | 128,000 | +28% |
| Input, $ per 1M tokens | $2.00 | $4.00 | +100% |
| Output, $ per 1M tokens | $8.00 | $20.00 | +150% |
| Cache read, $ per 1M tokens | $0.50 | $0.40 | -20% |
Prices and limits from models.dev (checked 2026-11-02). Confirm on the official pricing page. Compare the cost for your traffic in the old vs new model calculator.
Migrating from o3 to GPT-5.6 Sol
Not yet reviewed. We haven't written model-specific migration notes for o3 yet. Start with the provider's official guidance and the replacement's model page, and use this general checklist:
- Search your code, config and environment variables for
o3,o3-2025-04-16. - Re-run your evaluation set against gpt-5.6-sol before switching traffic.
- Recount tokens with the new model's tokenizer and re-check
max_tokens, context fit and cost. - Check tool calling, structured output and stop sequences on your real prompts.
- Dates apply to the OpenAI API. Fine-tuned models follow the same shutdown schedule as their base model. If you use OpenAI models through another platform, check that platform's own retirement schedule.
Check your code before Dec 11
Also shutting down on December 11, 2026
- GPT-5
gpt-5 - GPT-5 Mini
gpt-5-mini - GPT-5 Nano
gpt-5-nano - GPT-5 Pro
gpt-5-pro - o3-pro
o3-pro
All model retirements · All OpenAI deprecations
FAQ
When will o3 be retired?
o3 (o3) shuts down on the OpenAI API on December 11, 2026, according to the official OpenAI API deprecations page.
What should I use instead of o3?
The recommended replacement is gpt-5.6-sol.
What happens to o3 requests after the shutdown date?
After a model is retired, API requests to it return an error. Move traffic to the replacement and test it on your own prompts before the date.
Does this date apply to Amazon Bedrock, Vertex AI or Azure?
Dates apply to the OpenAI API. Fine-tuned models follow the same shutdown schedule as their base model. If you use OpenAI models through another platform, check that platform’s own retirement schedule.
Which model IDs are affected?
All of these: o3, o3-2025-04-16.