OpenAI GPT-5.6 Surpasses Claude Opus in Coding Tests
OpenAI GPT-5.6 Surpasses Claude Opus in Coding Tests
OpenAI’s GPT-5.6 Sol advanced model is moving from internal testing to public anticipation after early-access reports indicated it matches or exceeds Anthropic’s Claude Opus in coding efficiency. A review shared by an Nvidia principal engineer compared the model against Opus, noting that while GPT-5.6 Sol took longer to progress and failed more frequently in early stages, it generated simpler code and required less brute-force exploration. After 30 hours of operation, the model reportedly surpassed the speedup achieved by Claude Opus over a 64-hour run, prompting analysts to describe the architecture as favoring persistent research over parallel idea generation.
References to GPT-5.6 Sol, alongside variants Terra and Luna, were previously spotted in the code for OpenAI’s Codex app, prompting speculation that the public rollout is scheduled for next week. The emerging data points to a strategic shift toward direct debugging and optimized code generation rather than extensive exploration. The reviews arrive as competition intensifies, with Google’s Gemini 3.5 Pro reportedly advancing rapidly toward its own launch window.
From the sources (9 posts)
@testingcatalogGPT-5.6 Sol, Terra, and Luna are already mentioned in the code of the Codex app (but not available yet). Real-time voice support is still in the works. Now it is just a matter of time 👀
@kimmonismusGPT-5.6 being prepared for release, already in the codex apps though not usable. Release next weeks seems highly likely. Let’s go!
@andrewcurran_RT @testingcatalog: GPT-5.6 Sol, Terra, and Luna are already mentioned in the code of the Codex app (but not available yet). Real-time voic…
@kimmonismusRT @ChrisHayduk: With 5.6 Sol Ultra, I’ve not needed to read code at all. Very excited for everyone to get their hands on it
@kimmonismusFirst reports about GPT-5.6; The interesting thing about GPT-5.6 Sol is not that it looks cleaner than Opus. It apparently doesn’t. It progresses slower, fails more often, explores fewer ideas and writes far less code. But after 30 hours
@andrewcurran_GPT-5.6 Sol, reports from early access.
@kimmonismusThe big race is entering its next round: GPT-5.6 is waiting in the wings, but Gemini 3.5 Pro also seems to be approaching rapidly. The next few weeks are going to be very exciting, especially when it comes to whether Gemini now launches its
@mark_kReview of @OpenAI GPT-5.6 SOL by an Nvidia engineer with early access to the model! His review is not entirely positive when compared to Claude Opus. It seems to have a number of drawbacks for coding. But there are also good aspects, like
@8teapiRT @haider1: Nvidia principal engineer's review of GPT-5.6 Sol: tldr; - more depth-first, which means it sticks with harder ideas - more…