GPT-5.6 Terra AI Evaluation | LayerLens - Benchmark Results & Performance

Model

GPT-5.6 Terra by OpenAI

text+image+file->text

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GPT-5.6 Terra is the balanced mid-tier model in OpenAI's GPT-5.6 family, positioned between the flagship Sol and the cost-efficient Luna. It delivers competitive performance comparable to GPT-5.5 at roughly half the cost, making it well-suited for everyday coding, reasoning, and agentic workflows. Terra supports a 1M+ token context window and handles text, image, and file inputs. It is part of OpenAI's GPT-5.6 preview series, initially available to a limited group of trusted partners via the OpenAI API.

Evaluations

across 10 benchmarks

Median latency

3.5s

Context length

tokens

Cost

$2.50 · $15

input · output per 1M tokens

Key takeaways

Key takeaways will appear here once evaluations are run.

Technical specifications

Context length: 1M tokens
Max output: —
Architecture: MoE
Modalities: text+image+file->text
Parameters: —
Open weights: No
Licence: Proprietary
Regions: USA
Provider: OpenAI
Provider model key: openai/gpt-5.6-terra