GPT-6.1 Sol Redefines the Cost-Performance Frontier While Opus 5.5 Keeps the Intelligence Crown
Drawing on Artificial Analysis's Intelligence Index and per-task cost data, multiple Reddit users converged on a fairly consistent community verdict comparing GPT-6.1 Sol with Anthropic's Opus 5.5: pick Opus 5.5 for maximum intelligence, pick GPT-6.1 Sol for value.
Confirmed
- On the Artificial Analysis Intelligence Index, Opus 5.5 still leads in intelligence, with GPT-6.1 Sol falling short of both Opus 5.5 and Sonnet 5.5 (rhiever, danielmac8).
- However, GPT-6.1 Sol meaningfully pushed the intelligence/cost frontier: both rhiever and Randal Olson observed the value frontier was substantially redrawn after its release.
- Price comparison (relayed by that90sguy): GPT-6 Sol costs roughly half as much as Sonnet 5.5, one-third of GPT-5.6 Sol, and one-fifth of Opus 5.5.
- danielmac8 called GPT-6.1 Sol Pareto-optimal on the efficiency dimension, with standout value for money.
Why it matters
- The community had criticized GPT-6/6.1 Sol's performance relative to GPT-5.6 and Astra, but that90sguy pushed back, arguing critics ignore its price and efficiency advantages—reframing the debate from pure intelligence comparisons to intelligence per dollar.
- Usage guidance is converging (danielmac8, Randal Olson): budget-conscious users who care about intelligence per dollar should try GPT-6.1 Sol; those chasing the highest intelligence score at any cost should go with Opus 5.5.
2026-09-30 ~ 2026-09-30 · 5 related posts
- Episode 1: OpenAI Launches GPT-6 Sol and Luna at Half Price; Big Hallucination Gains but Not a Clean Sweep(2026-09-23, 92 posts)
- Episode 2: GPT-6 Sol/Luna launch splits opinion: half-price but dumber?(2026-09-23, 9 posts)
- Episode 3: LMArena Opens GPT-6 Sol and Luna for Public Testing(2026-09-23, 2 posts)
- Episode 4: Four New Models Reshape the Cost-Performance Frontier, Opus 5.5 Tops Intelligence Index(2026-09-23, 2 posts)
- Episode 5: OpenAI and Anthropic Slash Prices Within 90 Minutes, Kicking Off a New Model Price War(2026-09-23, 7 posts)
- Episode 6: Tests Show GPT-6 Sol Scales Nearly Linearly With Effort(2026-09-23, 3 posts)
- Episode 7: GPT-6 Astra Tops Bug Hunt Bench While Sol Version Regresses(2026-09-24, 2 posts)
- Episode 8: Leaks Map GPT-6 Codenames to GPT-5.6 Versions(2026-09-24, 3 posts)
- Episode 9: Bug Hunt Bench Ranks Frontier Coding Models on 105 Real Bugs with 200x Cost Gap(2026-09-24, 3 posts)
- Episode 10: GPT-6 Sol and Luna Launch With Aggressive API Pricing(2026-09-25, 2 posts)
- Episode 11: OpenAI's efficient GPT-6 models seen as freeing compute for bigger frontier models(2026-09-25, 2 posts)
- Episode 12: GPT-6 Sol Underestimated: 1.6x Robot Task Gains at 47% Lower Cost(2026-09-25, 2 posts)
- Episode 13: OpenAI Launches GPT-6.1 Sol: Near-Astra Intelligence at One-Fifth the Price(2026-09-30, 28 posts)
- Episode 14: GPT-6.1 Sol Matches Astra at a Fraction of the Cost Within a Week(2026-09-30, 4 posts)
- Episode 15: GPT-6.1 Sol Redefines the Cost-Performance Frontier While Opus 5.5 Keeps the Intelligence Crown(2026-09-30, 5 posts)
Primary sources
- [source] GPT-6.1-Sol shifts the intelligence-per-dollar frontier, but Opus 5.5 still tops raw scores — randal_olson · 2026-09-30
- [source] Opus 5.5 still tops AA intelligence, but GPT-6.1 Sol shifts the cost frontier — rhiever · 2026-09-30
- Reddit user defends GPT-6.1 Sol: a fifth the price of Opus 5.5 with better intelligence per dollar — that_90s_guy · 2026-09-30
- GPT-6.1 Sol Trails Opus and Sonnet 5.5 on Intelligence but Is Pareto-Optimal on Efficiency — daniel_mac8 · 2026-09-30
1 near-duplicate retellings: rhiever