Expired50% confidenceBenchmarkExact time
In the head-to-head comparison among GPT-5.6 Luna, Grok 4, and DeepSeek Flash, Luna wins on quality and safety, while DeepSeek has an advantage in cost and throughput.
1
Sources
50%
Confidence
Short-term (~14 days)
Relevance
9/28/2026
First Seen
This claim has expired. It is kept for the record and no longer describes the current state.
Valid until: 10/12/2026(expired)
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Related Claims
UnverifiedGPT-5.6's naming convention shifts from generation-number designations to capability-tier designations: Sol is the flagship top-tier model, Terra targets everyday high-frequency work with performance matching the previous-generation 5.5 but at a lower price, and Luna emphasizes speed and cost savings.74% similarUnverifiedGPT-6 Astra tends to generate better, more usable versions on the first attempt, with a high first-pass success rate and fast speed; DeepSeek V4.1 Flash improves quality through continuous self-checking and iteration but takes longer71% similarUnverifiedThe complete DeepSWE ranking in order is: GPT 5.5, GPT 5.4, Opus 4.7, followed by Sun 4.6, and Gemini 3.5 Flash (approximately 28%).71% similarUnverifiedSol is more efficient than GPT-5.5, but the token efficiency of Terra and Luna has actually declined.70% similarVerifiedThe three GPT-5.6 models are positioned as follows: Sol is the flagship performance model, Terra balances performance and cost, and Luna is the most economical option.70% similar
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