ResearchLLM Verifications Leaderboard

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

Head to head · tested 27 Oct 2026

GPT-6.1 Sol vs GPT-6.1 Terra Pro: accuracy, speed and price

Similar accuracy; GPT-6.1 Sol costs less per question.

OpenAIGPT-6.1 Sol76.2% score · #12$0.0029 per question41 tok/sOpenAIGPT-6.1 Terra Pro76.2% score · #12$0.005 per question— tok/s

Verdict

Built from the measurements below

  • Accuracy is too close to call: GPT-6.1 Sol scored 76.2% and GPT-6.1 Terra Pro 76.2% on the same 80 questions, a gap within what chance alone could produce.
  • GPT-6.1 Sol is 1.7× cheaper per question as billed ($0.0029 vs $0.005), reasoning tokens included.
  • GPT-6.1 Sol starts answering sooner: 2.1 s to the first token, against 8.5 s for GPT-6.1 Terra Pro.

Which should you choose?

Choose GPT-6.1 Sol for the lower cost per correct answer ($0.0037 against $0.0065), a quicker first token and shorter outputs (about 224 tokens per question against 453).

Accuracy gap +0.0 points (z = 0.00). 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-6.1 SolGPT-6.1 Terra ProEdge
Verification scoreHigher is better76.2%76.2%Too close to call
Cost per questionLower is better$0.0029$0.005GPT-6.1 Sol
Output speedHigher is better41—Not measured
Time to first tokenLower is better2.1 s8.5 sGPT-6.1 Sol
End-to-end response timeLower is better10.8 s9.0 sGPT-6.1 Terra Pro
Tokens per questionLower is better224453GPT-6.1 Sol
Context windowHigher is better1.1M1.1MSimilar

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-6.1 Sol first, GPT-6.1 Terra Pro second

Verification scorehigher is better
GPT-6.1 Sol76.2%
GPT-6.1 Terra Pro76.2%
Cost per questionlower is better
GPT-6.1 Sol$0.0029
GPT-6.1 Terra Pro$0.005
Output speedhigher is better
GPT-6.1 Sol41
GPT-6.1 Terra Pro—
Time to first tokenlower is better
GPT-6.1 Sol2.1 s
GPT-6.1 Terra Pro8.5 s
End-to-end response timelower is better
GPT-6.1 Sol10.8 s
GPT-6.1 Terra Pro9.0 s
Tokens per questionlower is better
GPT-6.1 Sol224
GPT-6.1 Terra Pro453
Context windowhigher is better
GPT-6.1 Sol1.1M
GPT-6.1 Terra Pro1.1M

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-6.1 SolGPT-6.1 Terra Pro
CreatorOpenAIOpenAI
Released29 Sept 202626 Oct 2026
Weights——
ReasoningYesYes
Inputfile, image, textfile, image, text
Outputtexttext
Context window1.1M tokens1.1M tokens
Knowledge cutoff——
List price in / out per 1M$2 / $10$1 / $5
Blended price per 1M (3:1)$4.00$2.00
Cheapest hostOpenAI · $1 / $5OpenAI · $0.5 / $2.5
Hosts on OpenRouter32
Last tested25 Oct 202627 Oct 2026

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GPT-6.1 Sol vs GPT-6.1 Terra Pro: frequently asked questions

Is GPT-6.1 Sol better than GPT-6.1 Terra Pro?
On accuracy they are statistically tied: GPT-6.1 Sol scored 76.2% and GPT-6.1 Terra Pro 76.2% on the same 80 questions from open datasets. Similar accuracy; GPT-6.1 Sol costs less per question.
Which is cheaper, GPT-6.1 Sol or GPT-6.1 Terra Pro?
GPT-6.1 Sol is cheaper: $0.0029 per question as billed, against $0.005. List prices: GPT-6.1 Sol $2 in / $10 out, GPT-6.1 Terra Pro $1 in / $5 out per million tokens.
Which has the larger context window, GPT-6.1 Sol or GPT-6.1 Terra Pro?
Both accept about the same amount of context: 1.1M and 1.1M tokens.