OpenAI
OpenAI GPT-6 model for focused, high-volume workloads where cost efficiency is the priority.
1.05M ctxUSD 0.10 / 1M input tok; USD 0.50 / 1M output tok
Introducing GPT-5.6 Sol (and Terra, Luna, Cyber)OpenAIReleased June 18, 2026
GPT-5.6 Sol (and Terra, Luna, Cyber)
Flagship model family of mid-2026 featuring Sol (flagship), Terra (balanced), Luna (high-speed), and Cyber (authorized vulnerability research).
reasoning-llmProprietary API$4.00 / 1M tok (Flagship Sol)Context: 1.05M (1,050,000 tokens)Arena ELO: 1515
Technical Specifications
Architecture Type
GPT-5.6 Flagship Reasoning Architecture
Total Parameters
Frontier Scale
Context Window
1.05M (1,050,000 tokens)
Max Output Tokens
128K (128,000 tokens)
Knowledge Cutoff
February 2026
Supported Modalities
text, code, vision, reasoning
License & Access
OpenAI Business Terms
Benchmark Evaluations
Mmlu Pro
91.2
Humaneval
99
Gdpval Aa v2 ELO
1710
Swe Bench Verified
72.7
Chatbot Arena ELO
1515
Deep Architectural Overview
GPT-5.6 Sol represents OpenAI’s most balanced frontier intelligence, offering lower pricing ($4/$20) than GPT-5.5 while advancing coding and professional knowledge scores across 1.05 million context tokens.
Strengths & Considerations
Core Strengths
- 1,050,000 context window
- Lower price than GPT-5.5 ($4.00 vs $5.00 input)
- Dedicated Cyber tier for authorized security research
Known Limitations
- Ultra-heavy end-to-end tasks handled by GPT-6 Astra
Token & API Pricing
Input Tokens (1M)$4.00
Output Tokens (1M)$20.00
Cached Input (1M)$0.4000
Pricing is verified directly against OpenAI's developer documentation and API rate sheets.
Similar & Alternative Models
Explore other frontier models from OpenAI and comparable reasoning engines.
OpenAI
OpenAI GPT-6 model built for complex coding and agentic workflows, balancing intelligence and cost.
1.05M ctxUSD 2 / 1M input tok; USD 10 / 1M output tok
OpenAI
OpenAI’s premier sixth-generation frontier model, built for the most demanding end-to-end software engineering and scientific research tasks.
1.05M ctx$10.00 / 1M tok (GPT-6 Frontier)
OpenAI
OpenAI’s premier full-duplex voice model for natural, expressive spoken dialogues with instantaneous interruption handling.
131.072K ctx$0.05 / min (Full-Duplex Voice)