OpenAI turns its GPT-5.5 sold-out party into a monthly Codex giveaway for 8,000 developers

OpenAI on Monday began emailing more than 8,000 developers who applied for its invite-only GPT-5.5 party with an unexpected consolation prize: a tenfold increase in Codex rate limits for their ChatGPT accounts, effective immediately and lasting until June 5.

"We had over 8,000 people express interest in just 24 hours, and while we wish our office was big enough to accommodate everyone, we couldn’t accommodate everyone who applied," the company wrote in an email, which was obtained by VentureBeat. "As a small token of thanks, we’ve added 10x your Codex level ratings until June 5th to your personal ChatGPT account."

The gift is not limited to the lucky few who received the party invitations themselves. Everyone who raised their hand — whether they were accepted, waitlisted, or turned away — received a raise in the grade limit, according to the email and confirmed by multiple recipients on social media.

CEO Sam Altman telegraphed this to X just before inboxes started lighting up. "We will do something nice for everyone who applied for a GPT-5.5 party and we don’t have room for it," he wrote. "I hope you enjoy it!" The post garnered more than 521,000 views within hours.

What a supercharged Codex access month means for developers

The visual effects are great. Codex, OpenAI’s AI-powered code agent, operates under daily usage caps that vary by subscription tier. A tenfold increase in those caps gives developers an incredibly large area to prototype, debug, and ship code using GPT-5.5 – which OpenAI says matches the per-token latency of GPT-5.4 while operating at a higher level of intelligence and using far fewer tokens to complete tasks.

A 31-day window is long enough to reshape habits. By empowering thousands of developers with expanded access at a critical time for adoption, OpenAI successfully supports the kind of deep, robust adoption that turns a curious experiment into a daily dependency. The bet is that once developers have fully experienced the Codex, they won’t want to go back – and that when the restrictions reset on June 5, a reasonable number will upgrade their subscriptions to preserve the workflows they’ve built.

The engineering community responded with a mixture of glee and regret. "I’m not actually taking off my Codex hat for the month," another developer announced on X. Others kicked themselves for not registering. "At that time I end up not registering because I am not in SF," another wrote.

Several users have raised a question that OpenAI has yet to publicly answer: is the boost stack and 20x multiplier for Pro $200 available? One user reported that OpenAI support said no – users get any upper limit, not the total amount. "The important question is not whether the 10x boost is only for group applicants," they wrote. "Whether it is filled with Pro."

OpenAI did not immediately respond to a request for comment on whether boost stacks with Pro-tier restrictions.

Inside the low-key meeting the AI ​​organized itself

The rate limit gift is a sidecar for the main event: "GPT-5.5 on 5/5," invitation-only gatherings starting tonight from 5:55 pm to 8:55 pm PDT at an undisclosed San Francisco location. OpenAI billed the evening as "low-key meeting with Sam and the team behind GPT-5.5," promising food, drinks, community, gifts, and swag — not a product announcement. Even the address remained confidential until the invitations were confirmed – a special touch that generated its own buzz.

In a detail that doubled as a product demo, Altman revealed that GPT-5.5 itself had been planned by the team. The model proposed a date of May 5, suggested that human developers give toasts rather than AI, and recommended setting up a suggestion box for the next generation model. Altman described this as "unusual emergent behavior." Registration closed shortly after opening due to high demand, Codex is in charge of the selection process.

Altman also extended the expected invitation. He publicly asked Elon Musk to attend, saying, "He can come if he wants to… the world needs more love.” The move comes amid Musk’s ongoing lawsuit against OpenAI seeking $150 billion — a fact that makes the invitation read less like diplomacy and more like performance art.

Anthropic’s competitive reception turns schedule overlap into a Silicon Valley spectacle

This is where the story gets interesting. VentureBeat has confirmed that Anthropic is hosting its own invite-only event in San Francisco on Tuesday evening – a "Media VIP Welcome Reception" about the same times at the OpenAI party. The reception serves as a warm-up for Anthropic Code by Claude’s developer conference, the company’s second annual gathering focused on its API, CLI tools, and Model Context Protocol (MCP). The conference proper will be held tomorrow.

The schedule overlap is hard to dismiss as coincidence. Both companies host developer-focused events on the same night, in the same city, targeting many of the same audiences. Whether this was a deliberate counter-arrangement or a genuine coincidence, the optics perfectly captures where things stand in the industry’s biggest rivalry.

Anthropic’s conference will bring together its senior teams and products to discuss Codex Claude, agent implementation strategies, and the product roadmap – all aimed squarely at the same audience of developers who recently received a month of free Codex development from OpenAI.

How Anthropic hit OpenAI with revenue — and what it means for the coding wars

The corresponding lunch hours are a public reflection of the all-important battle being waged for revenue, developer adoption, and investor confidence — one that is heavily tilted in Anthropic’s favor.

According to Counterpoint Research data, Anthropic surpassed OpenAI for the first time in the global LLM revenue market in Q1 2026, taking 31.4% compared to OpenAI’s 29%. But the close-tie title hides a striking structural divide. Counterpoint estimates Anthropic gained that share with about 134 million active users, compared to OpenAI’s roughly 900 million — yielding an average monthly revenue per active user of $16.20 for Anthropic compared to $2.20 for OpenAI. OpenAI commands massive scale; Anthropic generates seven times the revenue per user. That gap is the most intense in this race.

The change in business has been over a year in the making. Menlo Ventures – whose portfolio includes Anthropic – estimates that the company now captures 40% of corporate LLM spending, up from 24% the year before and 12% in 2023, while OpenAI’s share has dropped to 27% from 50% in the same period. Anthropic has maintained an almost 18-month streak at the top of the LLM leaderboards for coding, starting with Claude Sonnet 3.5 in June 2024. That dominance in coding – the first real killer AI application – has become a broad road to business adoption and the engine behind Anthropic’s acceleration of revenue.

The top line numbers tell the whole story. Anthropic said earlier this month that annual revenue has reached $30 billion, up from $9 billion by the end of 2025, with more than 1,000 enterprise customers now spending more than $1 million a year — a number the company says has doubled since February.

Sources familiar with Anthropic’s finances told TechCrunch that the run rate is currently close to $40 billion, driven largely by demand for Claude Code and Cowork. OpenAI, on the other hand, reached $25 billion in annual revenue as of February, according to Reuters – but the Wall Street Journal reported that the company recently missed its projections for user growth and revenue, with CFO Sarah Friar warning colleagues that if growth does not accelerate, the company may face difficulties in funding future computing agreements.

The momentum has continued to raise funds at a pace that could redraw the industry’s energy map. Anthropic raised $30 billion at a $380 billion valuation in February. Bloomberg reported last week that the company has begun weighing a new funding round worth more than $900 billion, potentially surpassing OpenAI as the world’s most valuable AI startup. OpenAI was valued at $852 billion in late March after closing a record $122 billion funding round. If Anthropic continues on the stated terms, the company will not only double its valuation but also surpass OpenAI – a turnaround that seemed unthinkable six months ago.

Two teams, two ideas, and one city at the center of the AI ​​industry’s defining battle

For the 8,000-plus developers who applied for the GPT-5.5 party, the immediate price is straightforward: a full month of incredibly extended Codex usage, for free, during a time when both companies are shipping at breakneck speed. In industry, the signal is hard to miss. Two of the world’s most important private companies compete for the loyalty of developers through a combination of free perks, invite-only parties, celebrity CEO engagements, and multibillion-dollar business — all within the same 24-hour window, in the same seven-square-mile city.

Wide stakes go beyond cocktail napkins and scale limits. Both companies are opposed to potential IPOs. Both fell in love with the same Wall Street patrons through a business partnership. Both race to define how the next generation of software is built – and by whom. Developers are caught between themselves, for now, the beneficiaries of a spending war that shows no sign of abating.

Tonight in San Francisco, the Anthropic reception starts at 5pm. The OpenAI party starts at 5:55pm. VentureBeat will be both. And somewhere between these two places, the 8,000 engineers who can’t fit into any room will be burning with their limits of new dimensions – they are building the future with whatever model they open first.

Michael Nunez is an editor at VentureBeat covering artificial intelligence. He is attending both the Anthropic Code and Claude Media VIP Welcome Reception and the OpenAI GPT-5.5 launch party this evening in San Francisco.

This story is developing and will be updated.