Migrating from gpt-3.5-turbo-0125 to gpt-5.6-terra

What changes when you move from gpt-3.5-turbo-0125 to gpt-5.6-terra: input price +300%, output price +700%, context window 16,385 → 1,050,000 tokens.

From: gpt-3.5-turbo-0125
Status: Deprecated
Shutdown: Oct 23, 2026
Time left: 8 days

To: gpt-5.6-terra
Status: Active
Shutdown: none announced
Time left: —

Prices

USD per 1M tokens, standard tier

Type	gpt-3.5-turbo-0125	gpt-5.6-terra	Change
Input	$0.50first seen October 1, 2026 · source	$2.00first seen October 1, 2026 · source	+300%
Cached input	Not published	$0.20first seen October 1, 2026 · source	—
Output	$1.50first seen October 1, 2026 · source	$12.00first seen October 1, 2026 · source	+700%

At 1M input and 250K output tokens a month: $0.875 on gpt-3.5-turbo-0125, $5.00 on gpt-5.6-terra (+471.4%).

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

Limits

Tokens

Limit	gpt-3.5-turbo-0125	gpt-5.6-terra	Change
Context window	16,385 tokensin place when tracking began (October 6, 2026) · source	1,050,000 tokensin place when tracking began (October 7, 2026) · source	+6308.3%
Max output tokens	4,096 tokensin place when tracking began (October 6, 2026) · source	128,000 tokensin place when tracking began (October 7, 2026) · source	+3025%

Benchmarks

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

Benchmark	gpt-3.5-turbo-0125	gpt-5.6-terra	Change
Arena TextArena, xhigh effort (vs no setting). Ranges don't overlap.	1226 ±5	1466 ±4	+240
Arena Text: CodingArena, xhigh effort (vs no setting). Ranges don't overlap.	1275 ±8	1517 ±7	+242
FrontierMath Tiers 1-3Epoch AI, max effort (vs no setting).	0.0%	86.0%	+86.0 pts
GPQA DiamondEpoch AI, max effort (vs no setting). Other settings not run → 87.4% low effort not run → 77.3% no reasoning	27.2%	93.3%	+66.1 pts
OTIS Mock AIME 2024-2025Epoch AI, max effort (vs no setting). Other settings not run → 88.9% low effort not run → 53.3% no reasoning	2.2%	99.7%	+97.5 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: supported on gpt-3.5-turbo-0125, not supported on gpt-5.6-terra.gpt-3.5-turbo-0125: in place when tracking began (October 6, 2026) · source · gpt-5.6-terra: in place when tracking began (October 7, 2026) · source

Same on both

Batch API: supported on both.gpt-3.5-turbo-0125: in place when tracking began (October 6, 2026) · source · gpt-5.6-terra: in place when tracking began (October 7, 2026) · source

Not published for gpt-3.5-turbo-0125: Structured outputs, Function calling, Prompt caching, Image input, PDF input, Reasoning / thinking, Built-in web search, temperature parameter, top_p parameter, logprobs.

Not published for gpt-5.6-terra: PDF input, temperature parameter, top_p parameter, logprobs.

Free tier

gpt-3.5-turbo-0125: no free tier listed

gpt-5.6-terra: 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

gpt-5.6-terra adds a free tier.

Aliases

All aliases

Aliases pointing at gpt-3.5-turbo-0125: gpt-3.5-turbo (in place when tracking began (October 7, 2026) · source)

No aliases point at gpt-5.6-terra.

On cloud platforms

All platform dates

Model	Platform	Platform ID	Shutdown	Time left
gpt-5.6-terra	Amazon Bedrock	openai.gpt-5.6-terra	not before Jul 13, 2027Active
gpt-5.6-terra	Microsoft Foundryversion 2026-07-09	gpt-5.6-terra	Jan 11, 2028Active	453 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 gpt-3.5-turbo-0125 to gpt-5.6-terra.
Re-check costs: gpt-5.6-terra costs more than gpt-3.5-turbo-0125 (input +300%, output +700%).

Time until shutdown

7days

11hours

23min

53sec

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: gpt-3.5-turbo-0125, gpt-5.6-terra.