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You can build a coding agent in 20 seconds with gpt-5.3-codex-spark

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Nick

18,697 subscribers

33,084 views • 7 months ago •via X (Twitter)

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GPT-5.3-Codex-Spark is now in research preview. You can just build things—faster.
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OpenAI took the best Coding model in the world GPT-5.3 Codex And turned it into a powerful coding app It's called Codex, but most people have no idea what you can build with it.
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what can you build with gpt-5.3-codex-spark? jason liu from OpenAI demos 3 real workflows — ones you can set up yourself inside the Codex app to help you spend less time on overhead and more time building. 00:09 – what is gpt-5.3-codex-spark? 00:25 – workflow 1: multi-agent daily briefing from slack, drive & meets 01:06 – workflow 2: automated PR review 01:31 – workflow 3: real-time interactive coding 02:56 – what speed changes, and what's coming next
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✨ GPT-5.3-Codex-Spark

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The model is faster, the pelican isn't as good! GPT-5.3 Codex Spark on the left, GPT-5.3 Codex 5.3 on the right - both at medium quality settings
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Firecrawl Skill, now in GPT-5.3 Codex 🔥 Give Codex clean, real-time web data for your coding workflows.
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> "Hey GPT-5.3-Codex, build a girlfriend simulator." 2 hours later:
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> "Hey GPT-5.3-Codex, build a girlfriend simulator." 2 hours later:

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I just built an entire app in 7 minutes using Codex Spark. EveryMCP: a universal MCP server installer that configures 15+ coding agents from a single CLI command. 12 Codex Spark subagents. All running in parallel. At the same time. The project itself isn't complicated, but just imagine what this looks like when you scale the complexity. My setup: • Codex 5.3 High to plan • Codex 5.3 Medium to orchestrate • 12 Codex Spark agents (xhigh) to implement in one shot Spark isn't competing with the big models. It's a different tool entirely. You orchestrate it. You run it in swarms. And it moves at a speed that wasn't possible before, even for the top 1% of AI coders. More complex workflows coming soon. Comment below if you want me to tell you how I did it.
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The latest models from OpenAI – GPT-5.4 and GPT-5.3-Codex – are already in your JetBrains IDE. See how @niklas_wortmann uses Codex with Skills to get task updates on his phone.
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This is so cool. In the next Codex update, multi agents will get a massive flexibility upgrade. "Hey Codex, when you implement this plan, I want you to delegate all the lower complexity tasks to GPT 5.3 Spark subagents" Instead of needing to create 100 different custom agent roles for different situations, you can just prompt your agent to spawn whatever model or reasoning level you want. With only natural language. No config files. No pre-defined roles. Just tell the orchestrator what to use and it listens.
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Continuing my vibe coding journey with 2d games From blank screen to below in just a few prompts Thanks to Agent Skills! > GPT 5.2 High + GPT 5.2 Codex in Codex CLI > Parallax scrolling > Fully animated character movement > PhaserJs Skill Not a single line of code written👇
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Okay this is DEEPLY concerning All my GPT 5.3 Codex requests are routing to GPT 5.2 I ran banteg script through all Codex models and ONLY 5.3 Codex was affected This is really really unacceptable, how can I trust the work done? cc: Tibo / Alexander Embiricos / Romain Huet
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Okay this is DEEPLY concerning All my GPT 5.3 Codex requests are routing to GPT 5.2 I ran banteg script through all Codex models and ONLY 5.3 Codex was affected This is really really unacceptable, how can I trust the work done? cc: Tibo / Alexander Embiricos / Romain Huet

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262,507 views • 6 months ago

OpenAI Codex-Spark powered by Cerebras You can now just build things faster—at 1,000 tokens/s.
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OpenAI Codex-Spark powered by Cerebras You can now just build things faster—at 1,000 tokens/s.

Cerebras

287,847 views • 7 months ago

Can AI really replace SaaS? We asked Codex Spark to build a simple Salesforce clone. It generated a build plan, then wrote all the code in 29 seconds. And it works! Add contacts, live search, full pipeline dashboard – all unit tests passed. The same task on full Codex took ~5× longer. For rapid prototyping and self-contained work, nothing beats Spark. ✨
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Can AI really replace SaaS? We asked Codex Spark to build a simple Salesforce clone. It generated a build plan, then wrote all the code in 29 seconds. And it works! Add contacts, live search, full pipeline dashboard – all unit tests passed. The same task on full Codex took ~5× longer. For rapid prototyping and self-contained work, nothing beats Spark. ✨

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