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

GPT-5.6 Terra at a glance

Good enough on 26/52 tasks at the 90% bar. Best value on 1 task. Best fit for: Long-form Content Generation, Social & Promotional Content.

Provider
OpenAI
Model name
gpt-5.6-terra
Cost mode:
Qualifies on
26 / 52 tasks (at 90% bar)
Best value on
1 tasks

Cost vs quality across all tasks

0%25%50%75%100%78910Quality score (7–10)Cost-efficiency vs best value (1.0 = best value)Research Query Generation — quality 8.19, 2.7x the cost of the best-value good-enough optionTheme Generation — quality 8.83, 5.5x the cost of the best-value good-enough optionActivity Feed Blurb Generation — quality 8.38, 6.7x the cost of the best-value good-enough optionClaim-Referenced Analyst Writing — quality 8.87, 3.2x the cost of the best-value good-enough optionSubstack Newsletter — quality 8.33, 9.4x the cost of the best-value good-enough optionInvestment Panel Voting — quality 8.24, 2.6x the cost of the best-value good-enough optionGeographic Region Identification — quality 8.72, 2.1x the cost of the best-value good-enough optionSocial Post Promotion — quality 8.59, 4.9x the cost of the best-value good-enough optionSubreddit Quality Vetting — quality 9.27, 4.6x the cost of the best-value good-enough optionS-1 TOC Extraction — quality 8.93, 6.9x the cost of the best-value good-enough optionAuthor Living-Person Safety Check — quality 8.81, 11.5x the cost of the best-value good-enough optionLanguage Detection — quality 9.99, 17.5x the cost of the best-value good-enough optionExecutive Summary Generation — quality 7.73, 8.9x the cost of the best-value good-enough optionTopic Report Relevance Scoring — quality 9.01, 3.6x the cost of the best-value good-enough optionSubreddit Selection for Research — quality 7.77, this model IS the best-value good-enough option★Landing Page Section Generation — quality 9.82, 3.8x the cost of the best-value good-enough optionTopic Cluster Naming — quality 8.28, 4.5x the cost of the best-value good-enough optionTopic Grouping and Client Matching — quality 8.46, 10.5x the cost of the best-value good-enough optionEngagement Triage — quality 8.71, 14.7x the cost of the best-value good-enough optionPrompt Adaptation — quality 8.32, 8.2x the cost of the best-value good-enough optionOnboarding Chapter Outline Generation — quality 9.46, 10.9x the cost of the best-value good-enough optionX Post Selection — quality 8.58, 11.0x the cost of the best-value good-enough optionAuthor Voice Generation — quality 8.89, 12.1x the cost of the best-value good-enough optionSEC S-1 Chunk Analysis — quality 8.96, 6.5x the cost of the best-value good-enough optionImage Prompt Generation — quality 9.19, 13.8x the cost of the best-value good-enough optionEngagement Reply Draft — quality 8.29, 2.6x the cost of 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
Subreddit Selection for Research ★Relevance, Classification & Matching90%MEDIUMbest value
Geographic Region IdentificationStructured Data & Fact Extraction93%HIGH2.1x
Investment Panel VotingFinancial Analysis & Trading Decisions91%MEDIUM2.6x
Engagement Reply DraftSocial & Promotional Content98%HIGH2.6x
Research Query GenerationInfrastructure & Utility96%HIGH2.7x
Claim-Referenced Analyst WritingLong-form Content Generation91%HIGH3.2x
Topic Report Relevance ScoringRelevance, Classification & Matching97%MEDIUM3.6x
Landing Page Section Generation bestLong-form Content Generation100%MEDIUM3.8x
Topic Cluster NamingTopic Organization & Clustering95%MEDIUM4.5x
Subreddit Quality VettingRelevance, Classification & Matching98%MEDIUM4.6x
Social Post PromotionSocial & Promotional Content97%RANKED4.9x
Theme GenerationLong-form Content Generation91%HIGH5.5x
SEC S-1 Chunk AnalysisFinancial Analysis & Trading Decisions97%HIGH6.5x
Activity Feed Blurb GenerationSocial & Promotional Content95%RANKED6.7x
S-1 TOC ExtractionStructured Data & Fact Extraction95%MEDIUM6.9x
Prompt AdaptationInfrastructure & Utility93%HIGH8.2x
Executive Summary GenerationContent Summarization & Synthesis97%HIGH8.9x
Substack NewsletterLong-form Content Generation90%HIGH9.4x
Topic Grouping and Client MatchingRelevance, Classification & Matching98%HIGH11x
Onboarding Chapter Outline GenerationLong-form Content Generation97%RANKED11x
X Post SelectionRelevance, Classification & Matching98%RANKED11x
Author Living-Person Safety CheckRelevance, Classification & Matching95%MEDIUM12x
Author Voice GenerationLong-form Content Generation92%RANKED12x
Image Prompt Generation bestInfrastructure & Utility100%HIGH14x
Engagement TriageRelevance, Classification & Matching98%RANKED15x
Language DetectionRelevance, Classification & Matching99%RANKED17x

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.