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Aider polyglot — well-formed responses — cost vs performance

Best current row per canonical model in the group “percent_cases_well_formed” (61 models) against cheapest current input price (USD / 1M tokens). The dashed line is the Pareto frontier: no model is both better and cheaper than a point on it.

open / restricted weights closed Pareto frontier (3 models)

Frontier models 3

Pareto frontier
Modelpercent_cases_well_formed on Aider polyglot — well-formed responsesRankcheapest current input price (USD / 1M tokens)ProviderTrust
Gemma 3 27BGoogle · Open weights100%1$0.08OpenRouterOfficial board
gpt-4.1-nanoOpenAI · Closed94.2%40$0.05OpenRouterOfficial board
gpt-oss-120bOpenAI · Open weights79.1%58$0.037OpenRouterOfficial board

Methodology. Points are the best current row per canonical model in comparability group 'percent_cases_well_formed'. Price = cheapest current offer across providers (the provider shown). Pareto frontier maximises the score and minimises x; exact ties are all kept. memory_estimate is an estimate (see /methodology). Only the selected comparability group is plotted; points under other configurations are not mixed in. Price = cheapest current offer across providers at the time of the last crawl. Nothing is estimated except where marked.