GPT-6 Luna vs GPT-6 Sol
GPT-6 Luna and GPT-6 Sol are closely matched at 44.5 and 49.4 on the LLM Stats Score. GPT-6 Luna is 20.0x cheaper per token.
OpenAI · OpenAI · Updated for 2026
Which is better?
GPT-6 Luna and GPT-6 Sol are closely matched on the overall LLM Stats Score at 44.5 and 49.4.
In the 5 individual benchmarks reported for both models, GPT-6 Sol wins 5; this is a narrower head-to-head signal than the composite indexes.
On price, GPT-6 Luna is roughly 20.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose GPT-6 Luna
- cost matters — it's about 20.0x cheaper per token
Choose GPT-6 Sol
- you value its reported benchmark strengths — it wins 5 of 5 exact shared results
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
5 reported for GPT-6 Luna · 5 for GPT-6 Sol
GPT-6 Luna outperforms in 0 benchmarks, while GPT-6 Sol is better at 5 benchmarks (Agents' Last Exam, AutomationBench v1.0.6, DeepSWE 1.1, FrontierCode 1.1, OSWorld 2.0).
GPT-6 Sol significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, GPT-6 Luna ($0.10/1M tokens) is 20.0x cheaper than GPT-6 Sol ($2.00/1M tokens).
For output processing, GPT-6 Luna ($0.50/1M tokens) is 20.0x cheaper than GPT-6 Sol ($10.00/1M tokens).
In conclusion, GPT-6 Sol is more expensive than GPT-6 Luna.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Both models have the same input context window of 1,050,000 tokens. Both models can generate responses up to 128,000 tokens.
Input capabilities
Documented input modalities across available providers
Both GPT-6 Luna and GPT-6 Sol support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
GPT-6 Luna
GPT-6 Sol
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
Both models were released on 2026-09-22.
They likely represent similar generations of model development.
Sep 22, 2026
0 days ago
Sep 22, 2026
0 days ago
Knowledge Cutoff
When training data ends
GPT-6 Luna has a knowledge cutoff of 2026-05-18, while GPT-6 Sol has a cutoff of 2026-04-20.
GPT-6 Luna has more recent training data (up to 2026-05-18), making it potentially better informed about events through that date compared to GPT-6 Sol (2026-04-20).
May 2026
1 mo newerApr 2026
Provider Availability
GPT-6 Luna is available from OpenAI. GPT-6 Sol is available from OpenAI.
GPT-6 Luna
GPT-6 Sol
Outputs Comparison
Judge for yourself.
Run your own prompts against GPT-6 Luna and GPT-6 Sol side-by-side, then vote on the output you prefer.
FAQ
Common questions about GPT-6 Luna vs GPT-6 Sol.