GPT-5
Ask HN: Agents get dumber before release of new model version?
I've noticed an effect with openai where my codex agents seem to perform worse in the week(s) leading up to a new release. I'm wondering if the vendors tweak effort params at all to free up hardware to host the new version. It's a double win as the new model will look night and day better to their regular users when the new model is released presumably with effort back at normal levels.<p>Is this a known phenomenon? Are any folks trying to measure any of this objectively?
Ask HN: Did Anthropic Just Win?
Not trying to cause drama, I feel the title is a bit too much but it's 100% how I feel. I'm genuinely curious what others think. I know there are a lot of people with more knowledge and info than me so I thought here is a good place to ask.Personally how I see it, benchmarks aside, Fable really is a tier above both Opus and Codex. Still makes mistakes, still needs supervision, but much less, and with a good feedback loop is able to achieve a lot independently. If OpenAI had something t
Tell HN: Codex once again automatically activates /fast on app update
Be aware that when you update Codex, OpenAI automatically activates /fast, even if this setting was turned off before the update. This will result in you burning way more credits than expected. How convenient for OpenAI.
OpenAI to remove GPT 5.2 and GPT 5.3 from Codex: Here is what is changing
OpenAI is retiring two of its older coding models from ChatGPT Codex next week. Thibault Sottiaux, OpenAI's engineering lead for Codex, announced on X that GPT-5.2 and GPT-5.3-Codex will be retired from the platform on 2 June for users logged in with a ChatGPT account. Instead, GPT-5.5 will replace them as the default model for
Claude Opus 4.6 vs GPT-5.3 Codex: Who is leading the coding agent race
The race to build the ultimate AI coding agent has entered a more mature, more revealing phase. With fresh releases from Anthropic and OpenAI, the competition is no longer about flashy demos or clever ...
Chronograph and OpenAI Announce Integration of Private Markets Data Into ChatGPT and Codex
Chronograph, a leading provider of portfolio monitoring, valuations, and analytics technology for private markets investors, announced a partnership with OpenAI to bring clients' trusted Chronograph data into ChatGPT and Codex. The integration enables private markets professionals to leverage their validated, auditable investment data directly alongside the AI workflows their teams increasingly rely on.
OpenAI ChatGPT Overhaul 2026: Super App Strategy Before IPO
OpenAI's ChatGPT overhaul will turn the platform into a super app with coding tools and AI agents before its 2026 IPO. Here's what's changing for 900M weekly users and why free access may shrink.
Meet the OpenAI Engineer Leading ChatGPT’s Biggest Transformation Yet
Thibault Sottiaux helped make AI coding one of OpenAI’s fastest-growing businesses. Now he’s overseeing a sweeping overhaul of ChatGPT.
You can now beat ChatGPT Codex rate limits, if you have friends
OpenAI is rolling out flexible, banked rate limit resets for ChatGPT Codex users, giving developers total control over their quota schedules.
OpenAI is giving 10x Codex usage limits to select users: How to get it
OpenAI is giving 10x Codex usage limits for a month to select users. The offer is aimed at people who are doing impressive or useful work using Codex.
Show HN: A GPT-realtime-2 tool that navigates your site by voice
Hi HN!It’s been over a month since gpt-realtime-2 is available but I haven’t seen many tools created with it yet. I think it is a very underrated (and fun!) model that you can do a lot of cool stuff with.I created a funny tool where you can embed a “mascot” on your website that you can talk to. It crawls the site and has all the main pages + sections in context. So it can scroll, navigate pages and open FAQ’s. I might add more functionality later but I want to get some other people to try it fir
Ask HN: Favorite prompts for improving LLM output?
I use Claude Code a lot and GPT 5.5 as well, and find that they are simultaneously extremely useful and also fall into common poor-performance basins. For example, writing performance -- perhaps my biggest issue with them is writing style -- such as well documented stylistic tics (em-dash, it's not x it's y), less commented stylistic tics ("the honest framing", "the earned XYZ"), cryptic and coined jargon, overabbreviation and sentences replaces by arrow constructio
Ask HN: Why not compare Fable 5 with GPT "Pro"? Why compare with GPT xhigh?
Every benchmark I see compares the super model Fable 5 with GPT 5.5 xhigh, but that's not a fair comparison because GPT 5.5 Pro has existed for a while and consistently delivers better results than Opus 4.8 Max, so doesn't it make more sense to compare Fable 5 with GPT Pro, instead?<p>FYI, both of them take a long time to respond, as opposed to GPT xhigh which often returns in a couple of minutes.
I complained to Anthropic over expired paid API credits and 31-day limits
@AnthropicAI:As a preliminary matter, I state the following clearly:
- I do not intend to accept any refund, compensation, reissued credits, account adjustment, or any other form of individualized relief.
- Nor do I intend to accept any settlement arrangement that would substitute private handling for a public apology, amendment of the relevant terms, and repair of the billing mechanism.
- The sole purpose of this complaint is to require Anthropic to provide a formal response to the unfair term
Show HN: I generated 235 system docs in a day using GPT-5.5
I generated 235 system documentation pages for a startup in about 8 hours using GPT-5.5 in Codex.We've been putting off the chore of writing technical docs since our team could handle all customer questions directly. However, since releasing an AI tool in the system, users have started asking it system questions as opposed to just data questions like it was designed for. It couldn't answer how-to questions, so, users got confused.We didn't have a direct way to teach the Ai about o
New Fable 5 Is a "Mythos-Class" LLM Available to All, Anthropic Announces
Anthropic unveils Claude Mythos 5 and Fable 5, a restricted-access frontier AI model and guardrailed version for everyone to ...
Anthropic releases state-of-the-art AI model Claude Fable 5, and it's safe to use
Anthropic has unveiled Claude Fable 5, the company's most capable model to date, with performance described as 'exceptional' in software engineering.
Anthropic’s Claude Fable is a version of Mythos the public can access today
Anthropic is releasing Claude Fable 5, its first Mythos-class model available to the public. The model comes with guardrails ...
Anthropic, which claimed AI model was too risky for public to use, releases ‘safe’ version
After hyping potential safety threats posed by its latest AI model, Anthropic says it is releasing a version with tweaks that ...
Anthropic Launches Mythos With Six Features You Absolutely Need
Anthropic launches Mythos with Fable 5. Six capabilities for agents: 80.3% code reasoning, extended thinking, autonomy. Vision, science acceleration, enterprise pricing
