OpenAI on Monday began sending emails to more than 8,000 developers who requested their by invitation only GPT-5.5 Party with a surprise consolation prize: a tenfold increase in Codex fee limits on your personal ChatGPT accounts, effective immediately and lasting through June 5th.
"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 make room for every person who applied." the company wrote in the email obtained by VentureBeat. "As a small token of gratitude, we’ve increased the Codex rate limits by 10x through June 5 in your personal ChatGPT account."
The giveaway isn’t limited to the lucky few who got invitations to the party itself. Everyone who raised their hand, whether accepted, waitlisted or rejected, received the rate limit increase, according to the email and confirmed by multiple recipients on social media.
CEO Sam Altman telegraphed the move to X shortly before inboxes started lighting up. "We are going to do something good for everyone who requested the GPT-5.5 party and for those of us who didn’t have space." he wrote. "I hope you enjoy it!" The post racked up more than 521,000 views in a matter of hours.
What a month of boosted Codex access really means for developers
The practical implications are enormous. CodexOpenAI’s artificial intelligence-based encryption agent operates with daily usage limits that vary by subscription level. A tenfold increase in those limits gives developers much more room to prototype, debug, and ship code using GPT-5.5 – which, according to OpenAI, matches the per-token latency of GPT-5.4 while performing at a higher level of intelligence and using significantly fewer tokens to complete tasks.
The 31-day window is generous enough to reshape habits. By flooding thousands of developers with expanded access during a critical adoption period, OpenAI is effectively subsidizing the kind of deep, sustained usage that turns a curious test into an everyday dependency. It’s a bet that once developers experience Codex at full speed, they won’t want to go back, and that when limits are reset on June 5, a significant number will upgrade their subscriptions to preserve the workflow they’ve created.
The developer community responded with a mix of joy and regret. "I literally won’t be taking my Codex hat off this month." a developer declared in X. Others beat themselves up for not registering. "That’s the last time I don’t check in just because I’m not in SF." one wrote.
Several users raised a question that OpenAI has not yet publicly answered: does the boost stack with the existing 20x Pro $200 tier multiplier? One user reported that OpenAI support said no: users get whatever limit is greater, not a combined total. "The key question is not whether the 10-fold increase is just for party applicants," they wrote. "It’s about whether it stacks with Pro."
OpenAI did not immediately respond to a request for comment on whether the boost stacks with the Pro tier caps.
Inside the discreet meeting an AI planned for itself
The rate cap giveaway is an add-on to the main event: "GPT-5.5 on 5/5," an invitation-only meeting taking place tonight from 5:55 pm to 8:55 pm PDT at an undisclosed location in San Francisco. OpenAI billed the night as "a low-key meeting with Sam and the team behind GPT-5.5," food, drinks, community, gifts and promising gifts, not a product advertisement. Even the address remained secret until the invitations were confirmed – a touch of exclusivity that generated its own stir.
In a detail that also serves as a product demonstration, Altman revealed that GPT-5.5 He planned the party himself. The model proposed the date of May 5, suggested that human developers provide instead of AI, and recommended setting up a suggestion box for the next-generation model. Altman described this as "strange popup behavior." Registrations closed shortly after opening due to overwhelming demand, with Codex handling the selection process.
Altman also extended an unlikely invitation. He publicly asked Elon Musk to attend and said: "You can come if you want… the world needs more love..” The gesture comes amid Musk’s ongoing lawsuit against OpenAI seeking up to $150 billion in damages, a fact that makes the invitation seem less like diplomacy and more like performance art.
Anthropic’s Competitive Reception Turns a Programming Overlay into a Silicon Valley Show
This is where the story gets interesting. VentureBeat has confirmed that Anthropic will host its own invitation-only event in San Francisco on Tuesday night: a "VIP media welcome reception" at almost identical moments to the OpenAI party. Reception serves as warm-up for Anthropic’s Code with Claude’s developer conferenceThe company’s second annual meeting focused on its API, CLI tools, and Model Context Protocol (MCP). The conference itself will take place tomorrow.
The overlapping schedules are difficult to dismiss as a coincidence. Both companies host developer-focused events on the same night, in the same city, targeting many of the same people. Whether it’s deliberate counterprogramming or genuine coincidence, the optics clearly capture where things stand in the industry’s biggest rivalry.
Anthropic’s conference will feature its executive and product teams discussing Claude Code, agent deployment strategies, and the product roadmap, all aimed squarely at the same developer audience that just received one month of free OpenAI Codex updates.
How Anthropic surpassed OpenAI in revenue and what it means for the coding wars
The mourning cocktail hours are a social manifestation of a much more consequential battle playing out over revenue, developer adoption, and investor confidence—a battle that has swung sharply in Anthropic’s favor.
According Counterpoint Research DataAnthropic surpassed OpenAI for the first time in global LLM revenue market share in Q1 2026, capturing 31.4% compared to OpenAI’s 29%. But the nearly tied headline masks a dramatic structural divergence. Counterpoint Anthropic estimates achieved that share with approximately 134 million monthly active users, compared to approximately 900 million for OpenAI, resulting in an average monthly revenue per active user of $16.20 for Anthropic versus $2.20 for OpenAI. OpenAI has massive scale; Anthropic earns approximately seven times more revenue per user. That gap is the central tension in this rivalry.
The business change has been brewing for more than a year. Menlo Ventures – whose portfolio includes Anthropic – estimates that the company now captures 40% of enterprise spending on LLM, up from 24% a year earlier and 12% in 2023, while OpenAI’s share fell to 27% from 50% during the same period. Anthropic has maintained a near-unparalleled 18 months at the top of the LLM leaderboards for coding, starting with Claude Sonnet 3.5 in June 2024. That mastery in code, the first truly killer application of AI, has become the path to broader enterprise adoption and the driving force behind Anthropic’s revenue acceleration.
The top-line numbers tell the rest of the story. Anthropic said earlier this month that its Annualized revenues have exceeded $30 billion.up from $9 billion at the end of 2025, and more than 1,000 business customers now spend more than $1 million a year, a figure the company says has more than doubled since February.
Sources familiar with Anthropic’s financials told TechCrunch that the run rate is currently closer to $40 billiondriven largely by demand from Claude Code and Cowork. OpenAI, meanwhile, led $25 billion in annualized revenue starting in February, according to Reuters, but the Wall Street Journal reported that the company has It recently missed its own user and revenue growth projections.and CFO Sarah Friar is warning colleagues that if growth doesn’t accelerate, the company could face difficulty funding future IT deals.
The momentum has shifted to fundraising at a pace that could redraw the industry’s power map. Anthropic raised $30 billion at a $380 billion valuation in February. Bloomberg reported last week that the company has begun weighing a new financing round that would value it at more than 900 billion dollarspotentially surpassing OpenAI as the world’s most valuable AI startup. OpenAI was valued at $852 billion at the end of March after a record close $122 billion financing round. If Anthropic proceeds as described, the company would not only more than double its valuation, but would also surpass OpenAI, a setback that seemed unthinkable six months ago.
Two parties, two visions and one city at the center of the rivalry that defines the AI industry
For the more than 8,000 developers who requested the GPT-5.5 PartyThe immediate value is simple: a full month of dramatically expanded Codex use, for free, during a period when both companies are shipping at a breakneck pace. For the industry, the signal is harder to miss. The world’s two most valuable private companies compete for developer loyalty with a combination of free perks, invitation-only parties, celebrity CEO appearances, and multimillion-dollar business ventures—all within the same 24-hour period, in the same seven-square-mile city.
The broader stakes extend far beyond cocktail napkins and rate limits. Both companies are headed toward possible IPOs. Both are courting the same Wall Street backers to create joint ventures. Both are competing to define how the next generation of software is built and who builds it. The developers caught between them are, for the moment, the beneficiaries of a spending war that shows no signs of cooling down.
Tonight in San Francisco, the Anthropic reception starts at 5 pm The OpenAI party starts at 5:55 pm VentureBeat will be at both. And somewhere between the two places, 8,000 developers who couldn’t get into either room will be burning through their new fee caps, building the future with the model they opened first.
Michael Nunez is an editor at VentureBeat covering artificial intelligence. Tonight he will be attending Anthropic Code’s VIP welcome reception with Claude Media and the OpenAI GPT-5.5 launch party in San Francisco.
This story is developing and will be updated.
