Why a Three-Way Grid Beats Pairs for tool-use LLM picks
The Compare Prices tool is the fastest way to put a shortlist of LLMs in a single grid — input cost, output cost, context window, and quality score in stacked columns you can scan vertically. Provider dropdowns let you mix models across Anthropic, OpenAI, Google, Meta, DeepSeek, Mistral, and xAI without leaving the page. A two-model comparison answers "which of these wins," but it doesn't catch the third option that quietly dominates both — and that's a common case for tool-use LLM picks. This guide grids **Claude Sonnet 4.7**, **GPT-5**, and **Gemini 2.5 Pro** in /tools/compare-prices so you can see all three side-by-side: input rates, output rates, context windows, and quality scores in stacked columns. The trio was picked because each represents a different point on the quality-vs-price curve — Gemini 2.5 Pro at the budget end, GPT-5 at the quality end, and GPT-5 winning the Value column with 65.6 (quality ÷ input cost). Pair this with flagship/balanced/fast/reasoning LLM tiers, Arena AI leaderboard Elo scores explained, and how LLM quality scores are calculated.
Building the Grid: Provider Dropdowns and Picks
Open /tools/compare-prices. Tick **Claude Sonnet 4.7** in the **Anthropic** dropdown, **GPT-5** in the **OpenAI** dropdown, and **Gemini 2.5 Pro** in the **Google** dropdown. The grid stacks them with input cost / output cost / context / quality in one row each. Claude Sonnet 4.7: $3.00 in, $15.00 out, 200K ctx, Q80. GPT-5: $1.25 in, $10.00 out, 200K ctx, Q82. Gemini 2.5 Pro: $1.25 in, $10.00 out, 1M ctx, Q78. The model ID column (visible on hover) is the string you paste into your SDK call.
Reading the Cost Spread
Input cost spans $1.25 to $1.25 — a 2.4× spread. Output cost matters more than input when reply length exceeds prompt length (typical for content generation, agents, code). Output-to-input ratios: Claude Sonnet 4.7 5.0×, GPT-5 8.0×, Gemini 2.5 Pro 8.0×. The model with the lowest output ratio tends to be the cheapest for generation-heavy workloads, regardless of input rate. For a workload mix calculator that bakes in your specific in/out ratio, run the same models through /tools/api-cost-estimator.
Quality and Value Tradeoffs
**GPT-5** leads on quality (82). **Gemini 2.5 Pro** leads on raw cost ($1.25/1M input). **GPT-5** leads on the Value column (65.6) — meaning the highest quality-adjusted return per dollar. In practice, this means: when accuracy is non-negotiable, pay for GPT-5; when budget is the binding constraint and quality just needs to clear a floor, ship Gemini 2.5 Pro; when you want the best default for production routing, GPT-5 is the answer. For the methodology behind that Value formula, see Value column vs tokens per dollar and quality per dollar LLM ranking 2026.
Workflow: From Grid to Production Decision
Once the trio is on screen, the workflow is: (1) eliminate any model whose quality is below the floor your workload tolerates — score < 50 for customer-facing, < 65 for reasoning-heavy. (2) of the survivors, compare Value column rankings. (3) for the top one or two, estimate monthly bill via /tools/api-cost-estimator using your expected token volume. (4) ship a 1-week A/B with GPT-5 as the gold-standard control and your Value pick as the candidate. The Compare Prices grid is the first step in that funnel — it eliminates the wrong picks fast. Both the price denominator (OpenRouter) and the quality numerator (Arena AI + Artificial Analysis) refresh hourly. So the comparison you screenshot Monday morning is still trustworthy at standup Tuesday morning — but you should re-run it before a quarterly model-routing review. Open /tools/compare-prices now, pick your provider dropdowns, and pin the shortlist that matches your workload.