FAQ: OpenAI Strikes Back: The Massive January 2026 API Update Explained

Question 1

1. When is GPT-4.5 Turbo available?

Accepted Answer

It is available immediately (as of Jan 8, 2026) for all Tier 2+ API users. Free tier users will get access rolling out next week.

Question 2

2. Does the new Stateful API cost extra?

Accepted Answer

No! In fact, it saves money. OpenAI charges a small storage fee for keeping the thread active (approx $0.05 per GB/day), which is significantly cheaper than re-sending tokens every time.

Question 3

3. How does this compare to DeepSeek V4?

Accepted Answer

DeepSeek V4 is still the king of raw cost (it's roughly 3x cheaper). However, OpenAI offers better integration (tools, function calling, state management).
Want to run it locally? Go DeepSeek.
Want to build a commercial SaaS fast? Go OpenAI.

Alyvro

FAQ: OpenAI Strikes Back: The Massive January 2026 API Update Explained

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