Claim: Claude Opus 5.5, GPT-6 Sol, and GPT-6 Luna represent a new pricing-driven commodity tier; GPT-6 Luna at $0.10/$0.50 is half the price of GPT-5.6 Luna and among the cheapest models ever released; Claude Opus 5.5 shows 20% input reduction and 60% cached-token reduction, addressing communication weaknesses; "max" reasoning level on Opus 5.5 over-thinks and fails on complex tasks.
Evidence: Concrete pricing table comparing GPT-6 Sol ($2/$10), GPT-6 Luna ($0.10/$0.50), Claude Opus 5.5 ($4/$20), GPT-5.6 equivalents, and earlier models; author's reproduction of the "pelican riding bicycle" SVG generation test across models with explicit output token failure (128k limit hit) and timing ($2.56, ~20 minutes per failure); author states using GPT-6 Sol and Claude Opus 5.5 as default models in Codex/Claude Code workflow.
Rationale
Directly applicable to Timothy's Claude Code + Codex workflow: author explicitly tests on the same stack (Codex, Claude Code) and now uses GPT-6 Sol and Opus 5.5 as defaults. GPT-6 Luna's $0.10/$0.50 pricing vs. GPT-5.6 Luna's $0.20/$1.20 cuts input costs by 50% and output by 58%—material for token-efficiency and agentic conversation patterns with high cache hit rates. The concrete failure case (Opus 5.5 "max" hitting 128k output limit on a simple task, costing $2.56) and the pricing table (verified across multiple vendors and version tiers) provide reproducible signal, not anecdote. Commoditization is already happening (release just happened, pricing war is live). Durability moderates because future model releases or prompt engineering tweaks may change the "max" over-thinking pathology, but the pricing tier itself is durable for at least one product cycle. Composition_specificity is moderate—pricing competitiveness matters to any agentic workflow, but no novel architectural pattern or infrastructure is required; Timothy switches models, not rewires. Source_credibility remains at baseline (2): this is a well-structured observational piece with real numbers and reproduction, but no independent verification and authored by a user sharing their experience, not a vendor release or peer-reviewed benchmark.