Writing - 2026

3 posts from 2026

May (1)

May 5, 2026

What OpenAI models support thinking, custom temperature, or both?

I ran a quick check against OpenAI models released in the last six months. “Thinking” here means the model accepted reasoning.effort; “custom temperature” means it accepted a non-default temperature parameter in the test.

What’s interesting to me is the number of models where it appears inconsistent. I wonder why this is?

Why does 5.5 NOT support custom temperature, but 5.4 does?

Model Created Thinking Custom temperature
gpt-5.5-2026-04-23 2026-04-23 Supported Unsupported
gpt-5.5-pro-2026-04-23 2026-04-23 Supported Unsupported
gpt-5.5-pro 2026-04-22 Supported Unsupported
gpt-5.5 2026-04-22 Supported Unsupported
gpt-5.4-mini-2026-03-17 2026-03-17 Supported Supported
gpt-5.4-nano-2026-03-17 2026-03-17 Supported Supported
gpt-5.4-mini 2026-03-14 Supported Supported
gpt-5.4-nano 2026-03-14 Supported Supported
gpt-5.4 2026-03-05 Supported Supported
gpt-5.4-2026-03-05 2026-03-05 Supported Supported
gpt-5.4-pro-2026-03-05 2026-03-05 Supported Unsupported
gpt-5.4-pro 2026-03-04 Supported Unsupported
gpt-5.3-chat-latest 2026-02-27 Supported Unsupported
gpt-4o-search-preview 2026-02-24 Unknown Unsupported
gpt-5.3-codex 2026-02-08 Supported Supported
gpt-5.2-codex 2025-12-19 Supported Unsupported
gpt-5.2-2025-12-11 2025-12-11 Supported Supported
gpt-5.2-pro-2025-12-11 2025-12-11 Supported Unsupported
gpt-5.2-chat-latest 2025-12-10 Supported Unsupported
gpt-5.2-pro 2025-12-10 Supported Unsupported
gpt-5.2 2025-12-09 Supported Supported
gpt-5.1-codex-max 2025-11-20 Supported Unsupported
gpt-5.1-codex-mini 2025-11-13 Supported Unsupported
gpt-5.1-2025-11-13 2025-11-13 Supported Supported
gpt-5.1-codex 2025-11-12 Supported Unsupported
gpt-5.1 2025-11-10 Supported Supported
gpt-5.1-chat-latest 2025-11-07 Supported Unsupported

February (2)

Feb 4, 2026

Despite what Anthropic Says, OpenAI Ads Aren't the End of the World

Anthropic published “Claude is a Space to Think” this week announcing Claude will be ad-free forever. The timing is obvious - OpenAI just said they’re testing ads in ChatGPT.

I can’t find much reason to care.

Obviously ads are noise and I’d rather not see them (tbh, most of the time I don’t - see banner blindness). But Anthropic’s post feels a bit like - dare I say it? - virtue signalling.

And OpenAI does have a real problem. Deutsche Bank analysts said “no startup in history has operated with losses on anything approaching this scale.” They’re projecting $143 billion in negative cash flow before turning profitable in 2029. Sam Altman has admitted they lose money on Pro subscriptions.

Anthropic’s argument is that ads could “subtly bias responses toward monetizable recommendations.” We don’t have evidence this will actually happen. OpenAI says ads appear at the bottom of responses, clearly labeled, separate from the answer, and that responses won’t be affected by ads. I have no reason to believe this to be the case until we have evidence to the contrary.

The world should definitely keep an eye on this, btw. I ask OpenAI for product recommendations all the time. I do NOT want those product suggestions to be influenced by ads. I think we absolutely should make certain that OpenAI is keeping to their word, and respond as necessary.

Further, this only affects Free and Go users:

“In the coming weeks, we’re also planning to start testing ads in the US for the free and Go tiers, so more people can benefit from our tools with fewer usage limits or without having to pay.” OpenAI

So who’s actually affected here? People using a free product, seeing clearly labeled ads, with the option to pay $20/month to remove them.

Sorry, I’m just not really bothered by that. Someone tell me why I should be?

Feb 3, 2026

OpenAI scaled to nearly a billion users using a single Postgres instance and 50 read replicas.

Some nuance: they delegate write-heavy workloads to Azure Cosmos DB and have stopped adding tables to the main database to ensure stability.

That said, what they pulled off with a single primary database is a massive engineering achievement.

Read the full writeup here.