Migrating from o3-mini-2025-01-31 to o4-mini-2025-04-16

What changes when you move from o3-mini-2025-01-31 to o4-mini-2025-04-16: input price 0%, output price 0%.

From: o3-mini-2025-01-31
Status: Deprecated
Shutdown: Oct 23, 2026
Time left: 8 days

To: o4-mini-2025-04-16
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	o3-mini-2025-01-31	o4-mini-2025-04-16	Change
Input	$1.10first seen October 1, 2026 · source	$1.10first seen October 1, 2026 · source	0%
Cached input	$0.55first seen October 1, 2026 · source	$0.275first seen October 1, 2026 · source	−50%
Output	$4.40first seen October 1, 2026 · source	$4.40first seen October 1, 2026 · source	0%

At 1M input and 250K output tokens a month: $2.20 on o3-mini-2025-01-31, $2.20 on o4-mini-2025-04-16 (0%).

Other tiers, prompt-size bands and modalities are on each model's page.

Limits

Tokens

Limit	o3-mini-2025-01-31	o4-mini-2025-04-16	Change
Context window	200,000 tokensin place when tracking began (October 7, 2026) · source	200,000 tokensin place when tracking began (October 7, 2026) · source	0%
Max output tokens	100,000 tokensin place when tracking began (October 7, 2026) · source	100,000 tokensin place when tracking began (October 7, 2026) · source	0%

Benchmarks

Same benchmark and source on both sides; settings named where they differ

Benchmark	o3-mini-2025-01-31	o4-mini-2025-04-16	Change
Arena TextArena. Ranges don't overlap.	1348 ±4	1391 ±4	+43
Arena Text: CodingArena. Ranges don't overlap.	1416 ±6	1433 ±7	+17
FrontierMath Tier 4Epoch AI, high effort.	0.0%	4.9%	+4.9 pts
FrontierMath Tiers 1-3Epoch AI, high effort. Other settings 10.5% → 28.8% medium effort 3.9% → 16.1% low effort	18.6%	36.1%	+17.5 pts
GPQA DiamondEpoch AI, high effort. Other settings 74.3% → 77.8% medium effort 68.2% → 75.3% low effort	77.0%	79.6%	+2.6 pts
MATH Level 5Epoch AI, high effort.	96.5%	97.8%	+1.3 pts
OTIS Mock AIME 2024-2025Epoch AI, high effort. Other settings 63.9% → 73.3% medium effort 44.4% → 57.8% low effort	76.9%	81.7%	+4.8 pts
SimpleQA VerifiedEpoch AI, low effort (vs high effort). Other settings 15.3% → 18.8% high effort	15.3%	19.6%	+4.3 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

Fine-tuning: not supported on o3-mini-2025-01-31, supported on o4-mini-2025-04-16.o3-mini-2025-01-31: 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

Structured outputs: supported on both.o3-mini-2025-01-31: in place when tracking began (October 7, 2026) · source · o4-mini-2025-04-16: in place when tracking began (October 7, 2026) · source
Function calling: supported on both.o3-mini-2025-01-31: in place when tracking began (October 7, 2026) · source · o4-mini-2025-04-16: in place when tracking began (October 7, 2026) · source
Batch API: supported on both.o3-mini-2025-01-31: in place when tracking began (October 7, 2026) · source · o4-mini-2025-04-16: in place when tracking began (October 7, 2026) · source
Reasoning / thinking: supported on both.o3-mini-2025-01-31: 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 o3-mini-2025-01-31: 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

o3-mini-2025-01-31: 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 aliases

Aliases pointing at o3-mini-2025-01-31: o3-mini (in place when tracking began (October 7, 2026) · source)

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
o3-mini-2025-01-31	Microsoft Foundryversion 2025-01-31	o3-mini	Nov 19, 2026Deprecated	35 days
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 o3-mini-2025-01-31 to o4-mini-2025-04-16.

Time until shutdown

7days

11hours

04min

18sec

Counting to 8:00 pm ET on October 22, 2026, which is 00:00 UTC on October 23, 2026.

Compared from AIWire's published data when this page loaded. Each fact links to the page it came from. Model pages: o3-mini-2025-01-31, o4-mini-2025-04-16.