# Changelog

## Changelog, page 55

24 February24 Feb

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    ## Python Vercel Functions bundle size limit increased to 500MB

    The bundle size limit for Python Vercel Functions has increased from 250MB to 500MB, allowing larger dependencies and assets in a single deployment. Learn more in the docs or deploy FastAPI or Flask to get started.

    Elvis Pranskevichus, Greg Schofield, and 2 others

    ](/changelog/python-vercel-functions-bundle-size-limit-increased-to-500mb)

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    ## GPT 5.3 Codex is now on AI Gateway

    You can now access OpenAI's newest model GPT 5.3 Codex via Vercel's AI Gateway with no other provider accounts required.

    Walter Korman, Jerilyn Zheng

    ](/changelog/gpt-5-3-codex-is-now-on-ai-gateway)

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    ## Slack Agent Skill simplifies building Slack agents with coding assistants

    Use the Slack Agent Skill in your favorite coding agent to simplify the otherwise complex task of building Slack integrated agents

    Timothy JordanVP of Developer Experience

    ](/changelog/slack-agent-skill-simplifies-building-slack-agents-with-coding-assistants)

23 February23 Feb

- [

    ## `npm i chat` – One codebase, every chat platform

    Chat SDK is now open source and available in public beta. It's a TypeScript library for building chat bots that work across Slack, Microsoft Teams, Google Chat, Discord, GitHub, and Linear — from a single codebase.

    Hayden Bleasel, Malte Ubl, and 4 others

    ](/changelog/chat-sdk)

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    ## Safely inject credentials in HTTP headers with Vercel Sandbox

    Sandbox network policies now support HTTP header injection to prevent secrets exfiltration by untrusted code

    Valerian Roche, Rob Herley

    ](/changelog/safely-inject-credentials-in-http-headers-with-vercel-sandbox)

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    ## Support for `now.json` will be removed on March 31, 2026

    Support for the deprecated "now.json" configuration file will be removed on March 31, 2026. Move to "vercel.json" instead.

    Tom KnickmanSoftware Engineer

    ](/changelog/support-for-now-json-will-be-removed-on-march-31-2026)

19 February19 Feb

- [

    ## Grok Imagine Video on AI Gateway

    Generate AI videos with xAI Grok Imagine via the AI SDK. Text-to-video, image-to-video, and video editing with natural audio and dialogue.

    Walter Korman , Jeremy Philemon, and 2 others

    ](/changelog/grok-imagine-video-on-ai-gateway)

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    ## Wan models on AI Gateway

    Generate stylized AI videos with Alibaba Wan models via the Vercel AI Gateway. Text-to-video, image-to-video, and unique style transfer (R2V) to transform existing footage into anime, watercolor, and more.

    Walter Korman , Jeremy Philemon, and 3 others

    ](/changelog/wan-models-on-ai-gateway)