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GPT-5.3-Codex-Spark
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gpt-5-3-codex-spark-1c118901·5 events·first seen Aliases: GPT-5.3-Codex-Spark
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Recent events (5)
OpenAI Codex app adds GPT-5.3-Codex-Spark model and conversation forking
OpenAI's Codex app release notes announce support for a new model variant, GPT-5.3-Codex-Spark, alongside UX features including conversation forking and a floating pop-out window. Windows alpha testing is also beginning. The update signals continued iteration on a specialized coding-focused model tier within the GPT-5 family.
OpenAI releases GPT-5.3-Codex-Spark, a real-time coding model exceeding 1000 tokens/second via Cerebras partnership
OpenAI launched a research preview of GPT-5.3-Codex-Spark, a smaller, latency-optimized variant of GPT-5.3-Codex targeting real-time coding workflows at over 1000 tokens per second. The release is available to ChatGPT Pro users via the Codex app, CLI, and IDE extension, but not yet through the API. It marks the first public milestone of OpenAI's partnership with Cerebras, whose inference hardware enables the high-throughput performance. The model is text-only with a 128k context window and operates under separate usage limits during the research preview.
OpenAI deprecates older GPT-5 and Codex model variants in ChatGPT
OpenAI is removing six model variants from the ChatGPT model picker starting April 7, 2026, including gpt-5.2-codex, gpt-5.1-codex-mini, gpt-5.1-codex-max, gpt-5.1-codex, gpt-5.1, and gpt-5, with full removal from Codex on April 14. Users are directed toward gpt-5.4, gpt-5.4-mini, gpt-5.3-codex, and gpt-5.2 as the supported options, with gpt-5.3-codex-spark available to Pro subscribers. The update signals OpenAI consolidating its model lineup around newer GPT-5.x variants and retiring earlier iterations.
The Batch: Jalapeño inference chip, Fugu multi-agent system, Claude Tag, Robin bio-agent, and Getty-OpenAI deal
OpenAI and Broadcom announced Jalapeño, OpenAI's first custom inference chip, designed in nine months with AI-assisted design and showing better performance-per-watt than current accelerators; engineering samples are already running GPT-5.3-Codex-Spark with datacenter deployment planned by end of 2026. Sakana AI released Fugu, a multi-agent routing system that scored 73.7% on SWE-Bench Pro, outperforming Claude Opus 4.8 and GPT-5.5 while remaining below the inaccessible Fable 5. Additional items cover Anthropic's Claude Tag Slack integration for async team collaboration, Seedance 2.5 video model improvements, the Robin autonomous biology research agent that identified a novel drug candidate, and a Getty Images licensing partnership with OpenAI.
Introducing GPT-5.3-Codex-Spark
OpenAI has announced GPT-5.3-Codex-Spark, described as their first real-time coding model. It offers 15x faster generation compared to prior coding models and supports a 128k context window. The model is currently available in research preview for ChatGPT Pro subscribers.