GPT-5.6 Luna vs Particle-1
GPT-5.6 Luna leads the LLM Stats Score 43.9 to 31.9. Particle-1 is 1.0x cheaper per token.
OpenAI · Particle AI · Updated for 2026
Which is better?
GPT-5.6 Luna leads the overall LLM Stats Score 43.9 to 31.9, ranking #54 overall.
In the 1 individual benchmarks reported for both models, GPT-5.6 Luna wins 1; this is a narrower head-to-head signal than the composite indexes.
GPT-5.6 Luna also accepts a larger context window (1,050,000 input tokens), making it the stronger choice for long documents and large codebases.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose GPT-5.6 Luna
- overall performance matters — it scores 43.9 and ranks #54 on LLM Stats
- your work emphasizes reasoning — it leads those capability indexes
- you value its reported benchmark strengths — it wins 1 of 1 exact shared results
- you process long inputs — it offers a 1,050,000 token context window
Choose Particle-1
- you want the most recent training data — it shipped Oct 2026
At a glance
The differences that matter most.
Individual benchmarks
45 reported for GPT-5.6 Luna · 3 for Particle-1
GPT-5.6 Luna outperforms in 1 benchmarks (GPQA), while Particle-1 is better at 0 benchmarks.
GPT-5.6 Luna 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-5.6 Luna ($0.20/1M tokens) is 1.3x cheaper than Particle-1 ($0.25/1M tokens).
For output processing, GPT-5.6 Luna ($1.20/1M tokens) is 1.2x more expensive than Particle-1 ($1.00/1M tokens).
In conclusion, GPT-5.6 Luna is more expensive than Particle-1.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
GPT-5.6 Luna accepts 1,050,000 input tokens compared to Particle-1's 1,048,576 tokens. Particle-1 can generate longer responses up to 131,072 tokens, while GPT-5.6 Luna is limited to 128,000 tokens.
Input capabilities
Documented input modalities across available providers
Both GPT-5.6 Luna and Particle-1 support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
GPT-5.6 Luna
Particle-1
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
GPT-5.6 Luna was released on 2026-07-09, while Particle-1 was released on 2026-10-28.
Particle-1 is 4 months newer than GPT-5.6 Luna.
Jul 9, 2026
3 months ago
Oct 28, 2026
-3 days ago
3mo newerKnowledge Cutoff
When training data ends
GPT-5.6 Luna has a documented knowledge cutoff of 2026-02-16, while Particle-1's cutoff date is not specified.
We can confirm GPT-5.6 Luna's training data extends to 2026-02-16, but cannot make a direct comparison without Particle-1's cutoff date.
Feb 2026
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Provider Availability
GPT-5.6 Luna is available from OpenAI. Particle-1 is available from Particle AI.
GPT-5.6 Luna
Particle-1
Outputs Comparison
Judge for yourself.
Run your own prompts against GPT-5.6 Luna and Particle-1 side-by-side, then vote on the output you prefer.
FAQ
Common questions about GPT-5.6 Luna vs Particle-1.