Model decision surface
Compare AI models
Start with GPT-6 Luna and gpt-oss-120b, or choose any two current ranked language models. Compare capability evidence, price, context, provider availability, and weight access without pretending one field decides every use case.
Current public data
GPT-6 Luna vs gpt-oss-120b
Live dataset updated 9/22/2026, 10:37:09 PM UTC
Open 1200×630 evidence receipt| Field | GPT-6 Luna OpenAI | gpt-oss-120b OpenAI |
|---|---|---|
| ModelCap position | #25 | #131 |
| Index score | 78.6 | 43.3 |
| Evidence | Measured3 public benchmark observations across 3 boards | Measured3 public benchmark observations across 3 boards |
| Input / 1M | $0.10 | $0.15 |
| Output / 1M | $0.50 | $0.60 |
| Pricing status | fresh | fresh |
| Context | 1M | 131K |
| Providers | 2 | 20 |
| Weight access | API only | Open weights |
Decision facts
- GPT-6 Luna is #25; gpt-oss-120b is #131 on the same current language board.
- Index scores are 78.6 for GPT-6 Luna and 43.3 for gpt-oss-120b. Their published uncertainty intervals do not overlap, but the aggregate Index does not predict performance on every task; compare the relevant benchmark configurations before choosing.
- Both positions use Measured evidence.
- Listed output price per 1M tokens is $0.50 for GPT-6 Luna and $0.60 for gpt-oss-120b. For 1,000 requests with 2,000 input and 500 output tokens each (2M input + 0.5M output), the listed-rate estimate is $0.45 for GPT-6 Luna versus $0.60 for gpt-oss-120b. GPT-6 Luna costs 25.0% less in this scenario. This excludes caching, batch discounts, prompt-length tiers, tool charges and retries; verify the selected endpoint before budgeting.
- Published context is 1,050,000 tokens for GPT-6 Luna and 131,072 for gpt-oss-120b.
- Weight access differs: GPT-6 Luna is none; gpt-oss-120b is open.
- ModelCap currently lists 2 providers for GPT-6 Luna and 20 for gpt-oss-120b.
These are separate published fields, not a synthetic winner. ModelCap does not collapse price, access, context, and capability evidence into a hidden recommendation score.
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Each comparison page is a permanent, shareable URL with the same live figures as this tool: ModelCap Index position, API pricing, context window, provider count, weight access and every shared benchmark board.