GPT-5.6 Luna Pro vs Solar Pro 4
| Signal | GPT-5.6 Luna Pro | Delta | Solar Pro 4 |
|---|---|---|---|
Capabilities | 100 | +33 | |
Benchmarks | 88 | +88 | |
Pricing | 99 | 0 | |
Context window size | 96 | +5 | |
Recency | 100 | -- | |
Output Capacity | 85 | 0 | |
| Overall Result | 3 wins | of 6 | 2 wins |
Score History
89
current score
GPT-5.6 Luna Pro
right now
40
current score
GPT-5.6 Luna Pro
OpenAI
Solar Pro 4
Upstage
Solar Pro 4 saves you $31.00/month
That's $372.00/year compared to GPT-5.6 Luna Pro at your current usage level of 100K calls/month.
| Metric | GPT-5.6 Luna Pro | Solar Pro 4 | Winner |
|---|---|---|---|
| Overall Score | 89 | 40 | GPT-5.6 Luna Pro |
| Rank | #31 | #234 | GPT-5.6 Luna Pro |
| Quality Rank | #31 | #234 | GPT-5.6 Luna Pro |
| Adoption Rank | #31 | #234 | GPT-5.6 Luna Pro |
| Parameters | -- | -- | -- |
| Context Window | 1050K | 524K | GPT-5.6 Luna Pro |
| Pricing | $0.10/$0.60/M | $0.03/$0.12/M | -- |
| Signal Scores | |||
| Capabilities | 100 | 67 | GPT-5.6 Luna Pro |
| Benchmarks | 88 | -- | GPT-5.6 Luna Pro |
| Pricing | 99 | 100 | Solar Pro 4 |
| Context window size | 96 | 91 | GPT-5.6 Luna Pro |
| Recency | 100 | 100 | GPT-5.6 Luna Pro |
| Output Capacity | 85 | 85 | Solar Pro 4 |
Our score (0-100) is driven by benchmark performance (90%) from Arena Elo ratings, MMLU, GPQA, HumanEval, SWE-bench, and 15+ standardized evaluations. Capabilities and context window serve as tiebreakers (10%). Learn more about our methodology.
Scores 89/100 (rank #31), placing it in the top 90% of all 290 models tracked.
Scores 40/100 (rank #234), placing it in the top 20% of all 290 models tracked.
GPT-5.6 Luna Pro has a 49-point advantage, which typically translates to noticeably stronger performance on complex reasoning, code generation, and multi-step tasks.
Choose GPT-5.6 Luna Pro when you need:
- Processing long documents or large codebases (1050K token context)
- Multimodal workflows that require image understanding
- Step-by-step reasoning and chain-of-thought problem solving
Choose Solar Pro 4 when you need:
- High-volume production workloads where API costs must be minimized
- Step-by-step reasoning and chain-of-thought problem solving
Solar Pro 4 offers 79% better value per quality point. At 1M tokens/day, you'd spend $2.25/month with Solar Pro 4 vs $10.50/month with GPT-5.6 Luna Pro - a $8.25 monthly difference.
Both models have comparable response speeds. For most applications, the latency difference is negligible.
When latency matters most: Interactive chatbots, IDE code completion, real-time translation, and user-facing applications where response time directly impacts experience. For batch processing, background summarization, or offline analysis, latency is less critical.
Code generation & review
Based on overall model capabilities and architecture for coding tasks like generating functions, debugging, and refactoring
Customer support chatbot
Suitable for user-facing chat with competitive response times. Solar Pro 4 also offers lower per-token costs for high-volume support
Long document analysis
Larger context window (1050K tokens) can process longer documents, contracts, and research papers in a single pass
Batch data extraction
Lower output pricing ($0.12/M) reduces costs when processing thousands of records daily
Creative writing & content
Higher overall composite score (89/100) correlates with better nuance, coherence, and style in long-form content
Image understanding & OCR
Supports vision input - can analyze screenshots, diagrams, photos, and scanned documents directly
GPT-5.6 Luna Pro clearly outperforms Solar Pro 4 with a significant 49-point lead. For most general use cases, GPT-5.6 Luna Pro is the stronger choice. However, Solar Pro 4 may still excel in niche scenarios.
By Use Case
Best for Quality
GPT-5.6 Luna Pro
Marginally better benchmark scores; both are excellent
Best for Cost
Solar Pro 4
79% lower pricing; better value at scale
Best for Reliability
GPT-5.6 Luna Pro
Higher uptime and faster response speeds
Best for Prototyping
GPT-5.6 Luna Pro
Stronger community support and better developer experience
Best for Production
GPT-5.6 Luna Pro
Wider enterprise adoption and proven at scale
by OpenAI
- Choose for Quality - Marginally better benchmark scores; both are excellent
- Choose for Reliability - Higher uptime and faster response speeds
- Choose for Prototyping - Stronger community support and better developer experience
- Choose for Production - Wider enterprise adoption and proven at scale
| Capability | GPT-5.6 Luna Pro | Solar Pro 4 |
|---|---|---|
| Vision (Image Input)differs | ||
| Function Calling | ||
| Streaming | ||
| JSON Mode | ||
| Reasoning | ||
| Web Searchdiffers | ||
| Image Output |
GPT-5.6 Luna Pro
OpenAI
Solar Pro 4
Upstage
Solar Pro 4 saves you $0.7020/month
That's 78% cheaper than GPT-5.6 Luna Pro at 1,000 tokens/request and 100 requests/day.
Assumes 60% input / 40% output token ratio per request. Actual costs may vary based on your usage pattern.
| Parameter | GPT-5.6 Luna Pro | Solar Pro 4 |
|---|---|---|
| Context Window | 1.1M | 524K |
| Max Output Tokens | 128,000 | 131,072 |
| Open Source | No | No |
| Created | Jul 9, 2026 | Aug 10, 2026 |