Migrating from o1-mini to o4-mini-2025-04-16
What changes when you move from o1-mini to o4-mini-2025-04-16: context window 128,000 → 200,000 tokens.
- From
- o1-mini
- Status
- Retired
- Shutdown
- Oct 27, 2025
- Time left
- —
- Status
- Deprecated
- Shutdown
- Oct 23, 2026
- Time left
- 8 days
o4-mini-2025-04-16 is itself deprecated, shutting down Oct 23, 2026. Its replacement is gpt-5.6-terra.
Prices
USD per 1M tokens, standard tier| Type | o1-mini | o4-mini-2025-04-16 | Change |
|---|---|---|---|
| Input | Not published | $1.10first seen October 1, 2026 · source | — |
| Cached input | Not published | $0.275first seen October 1, 2026 · source | — |
| Output | Not published | $4.40first seen October 1, 2026 · source | — |
Other tiers, prompt-size bands and modalities are on each model's page.
Limits
Tokens| Limit | o1-mini | o4-mini-2025-04-16 | Change |
|---|---|---|---|
| Context window | 128,000 tokensin place when tracking began (October 7, 2026) · source | 200,000 tokensin place when tracking began (October 7, 2026) · source | +56.3% |
| Max output tokens | 65,536 tokensin place when tracking began (October 7, 2026) · source | 100,000 tokensin place when tracking began (October 7, 2026) · source | +52.6% |
Benchmarks
Same benchmark, source and setting on both sides| Benchmark | o1-mini | o4-mini-2025-04-16 | Change |
|---|---|---|---|
| Arena TextArena. Ranges don't overlap. | 1337 ±4 | 1391 ±4 | +54 |
| Arena Text: CodingArena. Ranges don't overlap. | 1386 ±7 | 1433 ±7 | +47 |
GPQA DiamondEpoch AI, high effort.Other settings
| 62.4% | 79.6% | +17.2 pts |
| MATH Level 5Epoch AI, high effort. | 89.2% | 97.8% | +8.6 pts |
OTIS Mock AIME 2024-2025Epoch AI, high effort.Other settings
| 46.9% | 81.7% | +34.8 pts |
A score from one source is never compared with another source's, and company-reported scores are compared only within the same company; settings named where they differ. Data: Arena (arena.ai), CC BY 4.0; Epoch AI, Capabilities & benchmarking (epoch.ai/benchmarks), CC BY.
Features and parameters
Compare models- Batch API: not supported on o1-mini, supported on o4-mini-2025-04-16.o1-mini: in place when tracking began (October 7, 2026) · source · o4-mini-2025-04-16: in place when tracking began (October 7, 2026) · source
- Fine-tuning: not supported on o1-mini, supported on o4-mini-2025-04-16.o1-mini: in place when tracking began (October 7, 2026) · source · o4-mini-2025-04-16: in place when tracking began (October 7, 2026) · source
Same on both
- Reasoning / thinking: supported on both.o1-mini: in place when tracking began (October 7, 2026) · source · o4-mini-2025-04-16: in place when tracking began (October 7, 2026) · source
Not published for o1-mini: Structured outputs, Function calling, Prompt caching, Image input, PDF input, Built-in web search, temperature parameter, top_p parameter, logprobs.
Not published for o4-mini-2025-04-16: PDF input, Built-in web search, temperature parameter, top_p parameter, logprobs.
Free tier
o1-mini: no free tier listed
o4-mini-2025-04-16: Free for shared data, 10M tokens a day for Launch and Grow (2.5M for Build), in place when tracking began (October 12, 2026) (source) · All free models
o4-mini-2025-04-16 adds a free tier.
Aliases
All aliasesNo aliases point at o1-mini.
Aliases pointing at o4-mini-2025-04-16: o4-mini (in place when tracking began (October 7, 2026) · source)
On cloud platforms
All platform dates| Model | Platform | Platform ID | Shutdown | Time left |
|---|---|---|---|---|
| o4-mini-2025-04-16 | Microsoft Foundryversion 2025-04-16 | o4-mini | Nov 19, 2026Deprecated | 35 days |
Read daily from each platform's own pages. The status above uses each company's own date. Time left counts to 00:00 UTC on the shutdown date, which is the evening before in ET.
Checklist
- Change the model string from
o1-minitoo4-mini-2025-04-16.
Compared from AIWire's published data when this page loaded. Each fact links to the page it came from. Model pages: o1-mini, o4-mini-2025-04-16.