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Steven Heidel

@stevenheidel.com

API @OpenAI | πŸ³οΈβ€πŸŒˆ he/him

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03.06.2023
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Latest posts by Steven Heidel @stevenheidel.com

if you studied secret police in history class - who'd beat citizens and drag them off in unmarked vehicles - and thought, "I'd obviously have spoken up if I had been around back then"

well, now's your chance

11.01.2026 04:33 πŸ‘ 4 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Americans will be better off when he and his party are removed from power

06.01.2026 16:47 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

5 years on from January 6th it's worth reflecting on just how much contempt Donald Trump has for us, the American people. he’s pardoned criminals who've defrauded us, used our tax money to enrich himself and his friends, and continues to attack our democratic rights

06.01.2026 16:47 πŸ‘ 3 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

2026 is shaping up to be an incredibly gay year

26.12.2025 17:24 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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how was your year with chatgpt?

22.12.2025 23:15 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Introducing advanced tool use on the Claude Developer Platform Claude can now discover, learn, and execute tools dynamically to enable agents that take action in the real world. Here’s how.

also some neat new features around tool use www.anthropic.com/engineering/...

24.11.2025 19:55 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

congrats to Anthropic on the release of Claude Opus 4.5!

24.11.2025 19:55 πŸ‘ 9 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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Building more with GPT-5.1-Codex-Max Introducing GPT-5.1-Codex-Max, a faster, more intelligent agentic coding model for Codex. The model is designed for long-running, project-scale work with enhanced reasoning and token efficiency.

we were xhigh when we named this model openai.com/index/gpt-5-...

19.11.2025 19:58 πŸ‘ 5 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

congrats to google on the launch of gemini 3!

17.11.2025 23:25 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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OpenAI Platform Explore developer resources, tutorials, API docs, and dynamic examples to get the most out of OpenAI's platform.

read more here platform.openai.com/docs/guides/...

13.11.2025 21:16 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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setting "prompt_cache_retention" to "24h" in the Responses API can lead to significant cost and latency improvements in gpt-5.1, since prompts will be cached much longer than the normal 5-10 minutes

13.11.2025 21:16 πŸ‘ 7 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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Introducing GPT-5.1 for developers GPT-5.1 is now available in the API, bringing faster adaptive reasoning, extended prompt caching, improved coding performance, and new apply_patch and shell tools.

developers didn't have to wait long - gpt-5.1 is now available in the API! openai.com/index/gpt-5-...

13.11.2025 18:48 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

I have positions in both NYC and SF for senior backend and full-stack engineers, who can end-to-end own a number of new initiatives. If this sounds like you, send me a DM!

12.11.2025 21:15 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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I’m hiring for the API Frontiers team at OpenAI! We take the latest breakthroughs from research and turn them into developer products - designing APIs that feel natural, powerful, and scale to billions of users.

12.11.2025 21:15 πŸ‘ 3 πŸ” 1 πŸ’¬ 2 πŸ“Œ 0
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GPT-5.1: A smarter, more conversational ChatGPT We’re upgrading GPT-5 while making it easier to customize ChatGPT. Starting to roll out today to everyone, beginning with paid users.

openai.com/index/gpt-5-1/

12.11.2025 19:55 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

gpt-5.1 is now available in ChatGPT! smarter, faster, and with more options to customize its personality - because sometimes you don't need to be told that every question is a great question

12.11.2025 19:55 πŸ‘ 3 πŸ” 0 πŸ’¬ 2 πŸ“Œ 0
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exciting to see my current and former employers working together to scale AI compute!

03.11.2025 19:26 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

just made a donation to the Python Software Foundation. groups like the PSF should not be forced to add/remove unrelated policies in order to receive scientific grants.

30.10.2025 00:18 πŸ‘ 13 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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seems like a good day to remind everyone of the temporary chat button in ChatGPT, which will disable memory and remove the conversation from your history

14.10.2025 20:02 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 1
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another successful DevDay in the books. thanks to everyone who attended and also to our incredible events team - it was our biggest one yet!

08.10.2025 23:35 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

between the Apps SDK, Codex SDK, and AgentKit - how many startups did OpenAI just create today?

06.10.2025 22:43 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Introducing apps in ChatGPT and the new Apps SDK A new generation of apps you can chat with and the tools for developers to build them.

openai.com/index/introd...

06.10.2025 22:10 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

ChatGPT, the everything app

06.10.2025 21:30 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

it’s difficult to overstate how important Codex has been to our team’s ability to ship new products. for example: the drag and drop agent builder we launched today was built end to end in under 6 weeks, thanks to Codex writing 80% of the PRs

06.10.2025 20:11 πŸ‘ 14 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
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Apps SDK Learn how to use Apps SDK by OpenAI. Our framework to build apps for ChatGPT.

built on top of MCP! developers.openai.com/apps-sdk

06.10.2025 19:11 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

want more users? how does 800M users sound?
build and distribute your apps within ChatGPT with the new Apps SDK

06.10.2025 19:11 πŸ‘ 2 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Sam’s DevDay keynote starts in 15 minutes! what do you think he’s going to announce? πŸ‘€

06.10.2025 16:51 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

looking forward to DevDay today! send me a message if you're there and want to meet up - DMs are open

06.10.2025 15:36 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Agentic Commerce Design flows for embedded commerce in ChatGPT.

want to sell your products directly to ChatGPT users? try out the new Agentic Commerce Protocol (ACP) developers.openai.com/commerce

29.09.2025 18:57 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Why we built the Responses API How the Responses API unlocks persistent reasoning, hosted tools, and multimodal workflows for GPT-5.

why we built the Responses API developers.openai.com/blog/respons...

22.09.2025 23:25 πŸ‘ 3 πŸ” 0 πŸ’¬ 2 πŸ“Œ 0