Model
Model explorer
GPT-5.6 Terra
CLOSEDOpenAI · GPT-5.6 family · released Jul 9, 2026
Mid tier of the three-tier GPT-5.6 family (GA July 9, 2026 alongside Sol and Luna); OpenAI positions the tiers as 'durable capability tiers that can advance on their own cadence' — Terra is the balanced everyday model between flagship Sol and high-volume Luna. Same 1.05M context, 128K max output and Feb 2026 knowledge cutoff as Sol, at half Sol's price ($2.50/$15 vs $5/$30 per MTok). Distinct model tier, not a reasoning-effort configuration of Sol (each tier separately exposes its own effort settings).
ReasoningCodingVisionFunction callingTool useAgentic
2688.0
Elo · rank #17
Parameters
Undisclosed
Active params
—
Context
1.05M tokens
Architecture
Undisclosed architecture (presumed dense transformer); mid 'durable capability tier' of the GPT-5.6 Sol/Terra/Luna family, billed as balancing intelligence and cost
License
Proprietary
Languages
—
API price (in/out)
$2.5 / $15
Modalities
text · vision
Benchmark results
Bar shows position within the tracked field; marker = field best
best: GPT-6 Astra · 59.3%
best: Kimi K3 · 91.2%
best: GLM-5.3 · 84.5%
best: Claude Opus 5 · 43.3%
best: GPT-5.6 Sol · 89.0%
best: GPT-5.6 Sol · 83.0%
best: Claude Fable 5 · 1932
best: GPT-6 Astra · 96.0%
best: Claude Opus 5 · 64.7%
best: MiniMax M3 · 83.0%
best: Claude Opus 4.7 · 85.5%
best: Claude Fable 5.1 · 81.2%
best: GPT-5.6 Sol · 33.0%
best: Gemini 3.8 Flash · 89.4%
Run it locally
Closed weights — available via API only. No local deployment.
Input / M tok
$2.5
Output / M tok
$15
GPT-5.6 family
Elo progression across releases
API price $2.5/$15 · each benchmark row carries its own source badge (see methodology)