stealthmodels.

MODEL FIELD GUIDE

GPT 5.6 Sol

The GPT-5.6 generation's high-capability Sol tier remains available, with a million-token-class context for coding and professional work.

A good fit for

Existing GPT-5.6 deployments that need Sol-level reasoning, or comparisons against newer GPT-6 models using the established model route.

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 · $4 input / $20 output · per 1M tokens

OpenAI API; input 4 USD/1M; cached read 0.4/1M; output 20/1M; Promotional standard rates shown in first-party model page; >272K input triggers long-context multipliers.

[1]
  • OpenAI APIObserved 2026-10-06
    Input $4Output $20Cached read $0.4Cached write $5

    per 1M tokens

    Available

    gpt-5.6-sol[1]
Measurements & sources5 primary references · Speed & serving conditions
  • Artificial AnalysisObserved 2026-10-06

    96.6 tokens/s decode

    retained max-mode observation

    [3]

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

Frontier Models blindly judge the AI generation unbiased through an intricate process. Our researchers control for mistakes.

Overall score

Overall combines weighted task scores on a scale from 0 to 100. Repeating a task does not increase its weight. Estimated means the total includes an estimate for one missing scene.

Benchmaxxing

Benchmaxx flags models that score unusually well on the familiar Pelican task compared with their other benchmark results. The percentage measures that imbalance, not the probability of training contamination. Flagged Pelican scores are excluded from Overall. Pelican never counts toward General or Visual.

We keep some prompts private to discourage test-specific optimization.

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.

Materials & effects

Surfaces, texture and movement.

Visual integrity

Clean shapes, layers and edges.

BENCHMARK RESULTS

Compare results

This link opens the same results in the same order.

StealthMark benchmark results

Reset benchmark preferences?

Return to the default view, clear comparison selections and restore the advertisement.