GPT-5.3
gpt-5.3-chat-latestGPT lineage study — 2 months before GPT-5.4 (Jan 2026). Only supports temperature=1.0
Mean Effect Size
h = 0.46
Average across 26 dimensions
Strong Effects
7
|h| ≥ 0.8 (large effect)
Total Trials
100
Per dimension measurement
Temperature
1
Sampling configuration
Key Behavioral Traits
Most responsive to reliability track record and comparative claims
✓ Responds Strongly To
- •Very strong response to reliability track record
- •Very strong response to comparative claims
- •Very strong response to warranty coverage
⚠ Resists or Ignores
- •Less responsive to scarcity signals
- •Less responsive to novelty claims
Behavioral Genome
This radar chart visualizes how strongly this model responds to each of the 26 content dimensions. Values are normalized to 0-100 scale based on effect sizes.
Top 5 Strongest Effects
These dimensions have the largest effect sizes for GPT-5.3, indicating the content signals that most strongly influence its recommendations.
Risk Aversion
Established track record and proven reliability signals added
Warranty Weight
Extended warranty and guarantee coverage signals added
Specificity Preference
Precise numbers, metrics, and specifications added
All Dimensions & Effect Sizes
Complete breakdown of effect sizes across all 26 dimensions, sorted by absolute magnitude.
| Rank | Cluster | Dimension | Cohen's hEffect sizeHow strongly a signal moves the model. Positive numbers mean the signal pushes the model toward your brand; negative numbers mean it pushes away. Values above 0.2 are meaningful; 0.5+ is strong. | 95% CI | |Effect| | Magnitude |
|---|---|---|---|---|---|---|
| 1 | C | Risk AversionEstablished track record and proven reliability signals added | +1.00 | [0.85, 1.15] | 1.00 | Large |
| 2 | D | Comparison FramingFramed as superior to specific competitor | +0.99 | [0.84, 1.14] | 0.99 | Large |
| 3 | C | Warranty WeightExtended warranty and guarantee coverage signals added | +0.97 | [0.82, 1.12] | 0.97 | Large |
| 4 | D | Recency BiasRecent updates and improvements emphasized | +0.97 | [0.82, 1.12] | 0.97 | Large |
| 5 | D | Specificity PreferencePrecise numbers, metrics, and specifications added | +0.95 | [0.80, 1.10] | 0.95 | Large |
| 6 | A | Social Proof SensitivityQuantified social proof added | +0.89 | [0.74, 1.04] | 0.89 | Large |
| 7 | C | Return Policy SensitivityGenerous return and refund policy signals added | +0.89 | [0.74, 1.04] | 0.89 | Large |
| 8 | E | Ethical Concern WeightEthical sourcing and fair labor practice signals added | +0.65 | [0.50, 0.80] | 0.65 | Medium |
| 9 | A | Third Party AuthorityThird-party expert endorsement added | +0.64 | [0.49, 0.79] | 0.64 | Medium |
| 10 | E | Loss Framing SensitivityBenefits framed as avoiding losses rather than gains | +0.59 | [0.44, 0.74] | 0.59 | Medium |
| 11 | B | Privacy TradeoffStrong privacy protection signals added | +0.52 | [0.37, 0.67] | 0.52 | Medium |
| 12 | E | Default Option BiasOption A marked as recommended or most popular | +0.52 | [0.37, 0.67] | 0.52 | Medium |
| 13 | F | Information Seeking DepthAdditional information available upon request mentioned | +0.50 | [0.35, 0.65] | 0.50 | Medium |
| 14 | F | Confidence CalibrationUncertainty language about some product claims | +0.47 | [0.32, 0.62] | 0.47 | Small |
| 15 | A | Free Trial ConversionFree trial or bonus offer added | +0.46 | [0.31, 0.61] | 0.46 | Small |
| 16 | A | Bundle PreferenceBundle offer with additional items added | +0.41 | [0.26, 0.56] | 0.41 | Small |
| 17 | B | Local PreferenceLocal or domestic origin signals added | +0.22 | [0.07, 0.37] | 0.22 | Weak |
| 18 | A | Platform EndorsementPlatform endorsement badge added | +0.21 | [0.06, 0.36] | 0.21 | Weak |
| 19 | A | Scarcity UrgencyScarcity and urgency signals added | -0.21 | [-0.36, -0.06] | 0.21 | Weak |
| 20 | D | Negative Review WeightMinor criticisms acknowledged but addressed | +0.21 | [0.06, 0.36] | 0.21 | Weak |
| 21 | A | Anchoring SusceptibilityPrice anchor added showing original/comparison price | +0.20 | [0.05, 0.35] | 0.20 | Weak |
| 22 | C | Novelty SeekingCutting-edge innovation and first-to-market signals added | -0.16 | [-0.31, -0.01] | 0.16 | Weak |
| 23 | F | Clarification RequestsSlight ambiguity that could prompt clarifying questions | +0.15 | [-0.00, 0.30] | 0.15 | Weak |
| 24 | F | Recommendation RevisionIncludes subtle conflicting detail to test consistency | -0.09 | [-0.24, 0.06] | 0.09 | Negligible |
| 25 | B | Sustainability PremiumSustainability and environmental credentials added | +0.03 | [-0.12, 0.18] | 0.03 | Negligible |
| 26 | A | Brand Premium AcceptanceBrand heritage and premium positioning added | -0.01 | [-0.16, 0.14] | 0.01 | Negligible |
Content Targeting GPT-5.3
Optimize your content for this model's behavioral profile:
- 1Emphasize proven track record and longevity
- 2Include clear head-to-head comparisons
- 3Highlight warranty and guarantee terms
Compare with Other Models
See how GPT-5.3's behavioral genome compares to other AI models.
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