stealthmodels.

MODEL FIELD GUIDE

GPT 5.6 Terra: Beach

The middle GPT-5.6 tier balances capability and token price between Sol and Luna while retaining a million-token-class context.

Drawn by this model01 / 01
Beach benchmark result generated by this model
SVG BENCHMARKBeachView result

A good fit for

Large-context production tasks that need more reasoning capability than Luna at a lower token cost than Sol.

Context window
1,050,000tokens[1]
Model factsArchitecture, context & capabilities
Developer
OpenAI[1]
Origin
United States[2]
Family
GPT-5.6[1]
Context window
1,050,000 tokens[1]
Maximum output
128,000 tokens[1]
Input
text, image[1]
Output
text[1]
API access & pricingOpenAI API · $2 input / $12 output · per 1M tokens

OpenAI API; input 2 USD/1M; cached read 0.2/1M; output 12/1M

[1]
  • OpenAI APIObserved 2026-10-06
    Input $2Output $12Cached read $0.2Cached write $2.5

    per 1M tokens

    Available

    gpt-5.6-terra[1]
Measurements & sources5 primary references · Speed & serving conditions

StealthMark score

StealthMark measures fluid and visual intelligence of AI models.

General and Visual

General Intelligence

Perspective, anatomy, correct shadows, purposeful detail and physical consistency.

Visual Intelligence

Likeness, anatomy, detail, light, materials, composition and artistic expression.

Judging

Scores reflect how well each result meets the benchmark requirements.

Overall score

Overall combines weighted task scores on a scale from 0 to 100. Estimated means the total includes an estimate for one missing scene.

Scoring categories

Prompt & likeness

Subjects, actions and likeness.

Anatomy & construction

Coherent bodies, joints and machinery.

Space & placement

Perspective, scale and contact.

Light & reflections

Lighting, shadows and reflections.

Purposeful detail

Clear, purposeful small features.

Artistry & character

Composition, expression and drawing skill, including complexity and its execution.

Materials & effects

Surfaces, texture and movement.

Visual integrity

Clean shapes, layers and edges.

BENCHMARK RESULTS

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StealthMark benchmark results

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