ResearchLLM Verifications Leaderboard

Data as of · 78 models, 80 questions · reviewed by Suhas Bhairav · methodology

Head to head · tested 27 Oct 2026

GPT-6 Luna vs gpt-oss-120b: accuracy, speed and price

Similar accuracy; gpt-oss-120b costs less per question.

OpenAIGPT-6 Luna72.5% score · #21$0.00025 per question137 tok/sOpenAIgpt-oss-120b58.8% score · #41$0.00013 per question82 tok/s

Verdict

Built from the measurements below

  • Accuracy is too close to call: GPT-6 Luna scored 72.5% and gpt-oss-120b 58.8% on the same 80 questions, a gap within what chance alone could produce.
  • gpt-oss-120b is 2.0× cheaper per question as billed ($0.00013 vs $0.00025), reasoning tokens included.
  • GPT-6 Luna generates text 1.7× faster: 137 tokens per second against 82.
  • gpt-oss-120b starts answering sooner: 0.5 s to the first token, against 1.2 s for GPT-6 Luna.
  • GPT-6 Luna accepts more context: 1.1M tokens against 131k.

Which should you choose?

Choose GPT-6 Luna for faster streaming and a 1.1M-token context window. Choose gpt-oss-120b for the lower cost per correct answer ($0.00021 against $0.00034), a quicker first token, open weights you can run yourself and more hosts to choose from on OpenRouter (23 against 3). The widest subject gap is in law: GPT-6 Luna answered 3 of 6 correctly, gpt-oss-120b 1 of 6. With so few questions per subject, treat this as a lead to test on your own prompts, not a result.

Accuracy gap +13.7 points (z = 1.83). A winner is called only when z is at least 1.96, the usual 95% threshold. Speed, latency and price need a 10% margin.

Head to head

Same questions, same prompt, same API

MeasureGPT-6 Lunagpt-oss-120bEdge
Verification scoreHigher is better72.5%58.8%Too close to call
Cost per questionLower is better$0.00025$0.00013gpt-oss-120b
Output speedHigher is better13782GPT-6 Luna
Time to first tokenLower is better1.2 s0.5 sgpt-oss-120b
End-to-end response timeLower is better4.3 s5.4 sGPT-6 Luna
Tokens per questionLower is better431546GPT-6 Luna
Context windowHigher is better1.1M131kGPT-6 Luna

Side by side

Bars are scaled to the larger of the two values. The winner on each measure is marked in bold.

Every measure

GPT-6 Luna first, gpt-oss-120b second

Verification scorehigher is better
GPT-6 Luna72.5%
gpt-oss-120b58.8%
Cost per questionlower is better
GPT-6 Luna$0.00025
gpt-oss-120b$0.00013
Output speedhigher is better
GPT-6 Luna137
gpt-oss-120b82
Time to first tokenlower is better
GPT-6 Luna1.2 s
gpt-oss-120b0.5 s
End-to-end response timelower is better
GPT-6 Luna4.3 s
gpt-oss-120b5.4 s
Tokens per questionlower is better
GPT-6 Luna431
gpt-oss-120b546
Context windowhigher is better
GPT-6 Luna1.1M
gpt-oss-120b131k

Score vs. cost per question

Both models in color, every other model in grey

Most attractive quadrant0255075100$0.00001$0.0001$0.001$0.01$0.10Cost per question (USD, log) →Verification score (%) →Qwen3.8 2.4T A95BCommand AReka Flash 3Gemma 4 26B A4BGemma 4 31BQwen3.5 397B A17BHermes 4 405BMuse WonderGrok 4.7o3gpt-oss-20bMinistral 3 3B 2512Nova Micro 1.0Phi 4Granite 4.2 8BHy3GLM 5.3 FlashSolar Pro 4Trinity Large ThinkingMiniMax M3Mistral Large 4Claude Opus 5.5GPT-6.1 SolGemini 4 ArgonGPT-5.4GPT-6 Lunagpt-oss-120bLlama 4 Maverick

Specifications and pricing

From OpenRouter's catalogue, plus the leaderboard's test dates

SpecificationGPT-6 Lunagpt-oss-120b
CreatorOpenAIOpenAI
Released22 Sept 20265 Aug 2025
Weights—Open weights
ReasoningYesYes
Inputfile, image, texttext
Outputtexttext
Context window1.1M tokens131k tokens
Knowledge cutoff—30 Jun 2024
List price in / out per 1M$0.1 / $0.5$0.15 / $0.6
Blended price per 1M (3:1)$0.20$0.26
Cheapest hostOpenAI · $0.05 / $0.25Near AI · $0.03 / $0.15
Hosts on OpenRouter323
Last tested25 Oct 202625 Oct 2026

Compare any two models →

GPT-6 Luna vs gpt-oss-120b: frequently asked questions

Is GPT-6 Luna better than gpt-oss-120b?
On accuracy they are statistically tied: GPT-6 Luna scored 72.5% and gpt-oss-120b 58.8% on the same 80 questions from open datasets. Similar accuracy; gpt-oss-120b costs less per question.
Which is cheaper, GPT-6 Luna or gpt-oss-120b?
gpt-oss-120b is cheaper: $0.00013 per question as billed, against $0.00025. List prices: GPT-6 Luna $0.1 in / $0.5 out, gpt-oss-120b $0.15 in / $0.6 out per million tokens.
Which is faster, GPT-6 Luna or gpt-oss-120b?
GPT-6 Luna is faster at 137 output tokens per second, against 82. Time to first token: 1.2 s for GPT-6 Luna, 0.5 s for gpt-oss-120b.
Which has the larger context window, GPT-6 Luna or gpt-oss-120b?
GPT-6 Luna, with 1.1M tokens against 131k.