The Right-Sized LLM Benchmark Cheapest LLM that's good enough.

GPT-5.6 Luna at a glance

Good enough on 31/52 tasks at the 90% bar. Best value on 27 tasks. Best fit for: Infrastructure & Utility, Long-form Content Generation.

Provider
OpenAI
Model name
gpt-5.6-luna
Cost mode:
Qualifies on
31 / 52 tasks (at 90% bar)
Best value on
27 tasks

Cost vs quality across all tasks

0%25%50%75%100%678910Quality score (6–10)Cost-efficiency vs best value (1.0 = best value)Public Response Generation — quality 8.09, this model IS the best-value good-enough option★Reference Preserving Analytical Writing — quality 8.54, this model IS the best-value good-enough option★Short Promotional Teaser Generation — quality 8.35, this model IS the best-value good-enough option★Atomic Fact Claim Extraction — quality 7.67, this model IS the best-value good-enough option★Content Set Relevance Scoring — quality 6.36, this model IS the best-value good-enough option★Multi Perspective Decision Synthesis — quality 8.10, this model IS the best-value good-enough option★Topic Section Assignment — quality 7.99, this model IS the best-value good-enough option★Research Query Validation — quality 7.89, this model IS the best-value good-enough option★Visual Theme Configuration Generation — quality 9.01, this model IS the best-value good-enough option★Community Policy Evaluation — quality 9.24, this model IS the best-value good-enough option★Research Community Selection — quality 7.43, this model IS the best-value good-enough option★Report Outline Generation — quality 9.36, this model IS the best-value good-enough option★Engagement Opportunity Triage — quality 8.72, this model IS the best-value good-enough option★Language Identification — quality 9.96, 1.2x the cost of the best-value good-enough optionSocial Post Portfolio Selection — quality 8.46, 1.1x the cost of the best-value good-enough optionEvidence Grounded Claim Generation — quality 8.03, this model IS the best-value good-enough option★Voice Profile Generation — quality 9.05, this model IS the best-value good-enough option★Authoritative Source Selection — quality 7.91, this model IS the best-value good-enough option★Batch Text Translation — quality 8.73, this model IS the best-value good-enough option★Topic Taxonomy Matching — quality 7.62, this model IS the best-value good-enough option★Content To Image Prompt Generation — quality 8.84, this model IS the best-value good-enough option★Profiled Document Section Analysis — quality 8.67, this model IS the best-value good-enough option★Generated Content Relevance Scoring — quality 8.79, this model IS the best-value good-enough option★Promotional Message Generation — quality 8.49, this model IS the best-value good-enough option★Structured Content Summarization — quality 8.89, 1.3x the cost of the best-value good-enough optionThematic Topic Discovery — quality 7.94, this model IS the best-value good-enough option★Structured Output Extraction — quality 9.67, 1.6x the cost of the best-value good-enough optionSection Prompt Generation — quality 8.48, this model IS the best-value good-enough option★Model Specific Prompt Adaptation — quality 8.46, this model IS the best-value good-enough option★Research Query Generation — quality 7.63, this model IS the best-value good-enough option★Persona Policy Eligibility Check — quality 8.30, this model IS the best-value good-enough option★

within ~1.3× of the best-value model · 1.3–2× · >2× · ★ this model is the best-value pick on that task. Top-right = best quadrant. Only tasks where this model qualifies at the 90% bar are plotted.

Per-task breakdown

TaskCategoryQuality (% of best)ConfidenceOverpay
Content To Image Prompt Generation ★Infrastructure & Utility98%RANKEDbest value
Model Specific Prompt Adaptation ★Infrastructure & Utility96%HIGHbest value
Research Query Generation ★Infrastructure & Utility94%HIGHbest value
Research Query Validation ★Infrastructure & Utility90%MEDIUMbest value
Content Set Relevance Scoring ★Relevance, Classification & Matching90%MEDIUMbest value
Reference Preserving Analytical Writing ★Long-form Content Generation93%HIGHbest value
Research Community Selection ★Relevance, Classification & Matching93%HIGHbest value
Community Policy Evaluation ★Relevance, Classification & Matching100%MEDIUMbest value
Visual Theme Configuration Generation ★Long-form Content Generation96%HIGHbest value
Thematic Topic Discovery ★Topic Organization & Clustering93%MEDIUMbest value
Short Promotional Teaser Generation ★Social & Promotional Content95%RANKEDbest value
Batch Text Translation ★Infrastructure & Utility93%RANKEDbest value
Section Prompt Generation ★Infrastructure & Utility99%MEDIUMbest value
Voice Profile Generation ★Long-form Content Generation92%RANKEDbest value
Promotional Message Generation ★Social & Promotional Content97%RANKEDbest value
Atomic Fact Claim Extraction ★Structured Data & Fact Extraction96%RANKEDbest value
Multi Perspective Decision Synthesis ★Financial Analysis & Trading Decisions92%HIGHbest value
Profiled Document Section Analysis ★Financial Analysis & Trading Decisions95%RANKEDbest value
Generated Content Relevance Scoring ★Relevance, Classification & Matching96%MEDIUMbest value
Topic Taxonomy Matching ★Relevance, Classification & Matching90%MEDIUMbest value
Topic Section Assignment ★Topic Organization & Clustering92%MEDIUMbest value
Report Outline Generation ★Long-form Content Generation97%RANKEDbest value
Authoritative Source Selection ★Relevance, Classification & Matching90%HIGHbest value
Persona Policy Eligibility Check ★Relevance, Classification & Matching90%MEDIUMbest value
Public Response Generation ★Social & Promotional Content95%RANKEDbest value
Evidence Grounded Claim Generation ★Content Summarization & Synthesis91%MEDIUMbest value
Engagement Opportunity Triage ★Relevance, Classification & Matching98%RANKEDbest value
Social Post Portfolio SelectionRelevance, Classification & Matching96%RANKED1.1x
Language IdentificationRelevance, Classification & Matching99%RANKED1.2x
Structured Content SummarizationContent Summarization & Synthesis96%RANKED1.3x
Structured Output ExtractionStructured Data & Fact Extraction99%RANKED1.6x

Overpay — how much more you pay by running this model instead of the best-value model that clears the quality bar on that task (marked ★). "16x" means you overpay 16× — the same output for 16× the best-value good-enough option; ★ means this model is that option (no overpayment). Confidence — how sure we are about the quality score (more judgments + more agreement = higher confidence): RANKED many independent judges scored this model's outputs and their agreement is very high (most confident) — HIGH many judges have scored it and they mostly agree (well-pinned) — MEDIUM enough judges have weighed in to publish, but they disagree more than we'd like (treat with a small grain of salt). LOW-confidence cells are hidden everywhere on the site. See the methodology for the exact thresholds.