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 Terra vs GPT-6 Sol: accuracy, speed and price

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

OpenAIGPT-6.1 Terra73.8% score · #18$0.0013 per question122 tok/sOpenAIGPT-6 Sol73.8% score · #18$0.0024 per question92 tok/s

Verdict

Built from the measurements below

  • Accuracy is too close to call: GPT-6.1 Terra scored 73.8% and GPT-6 Sol 73.8% on the same 80 questions, a gap within what chance alone could produce.
  • GPT-6.1 Terra is 1.8× cheaper per question as billed ($0.0013 vs $0.0024), reasoning tokens included.
  • GPT-6.1 Terra generates text 1.3× faster: 122 tokens per second against 92.
  • GPT-6 Sol starts answering sooner: 0.9 s to the first token, against 2.4 s for GPT-6.1 Terra.

Which should you choose?

Choose GPT-6.1 Terra for the lower cost per correct answer ($0.0017 against $0.0032) and faster streaming. Choose GPT-6 Sol for a quicker first token.

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 TerraGPT-6 SolEdge
Verification scoreHigher is better73.8%73.8%Too close to call
Cost per questionLower is better$0.0013$0.0024GPT-6.1 Terra
Output speedHigher is better12292GPT-6.1 Terra
Time to first tokenLower is better2.4 s0.9 sGPT-6 Sol
End-to-end response timeLower is better5.8 s4.4 sGPT-6 Sol
Tokens per questionLower is better195174GPT-6 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 Terra first, GPT-6 Sol second

Verification scorehigher is better
GPT-6.1 Terra73.8%
GPT-6 Sol73.8%
Cost per questionlower is better
GPT-6.1 Terra$0.0013
GPT-6 Sol$0.0024
Output speedhigher is better
GPT-6.1 Terra122
GPT-6 Sol92
Time to first tokenlower is better
GPT-6.1 Terra2.4 s
GPT-6 Sol0.9 s
End-to-end response timelower is better
GPT-6.1 Terra5.8 s
GPT-6 Sol4.4 s
Tokens per questionlower is better
GPT-6.1 Terra195
GPT-6 Sol174
Context windowhigher is better
GPT-6.1 Terra1.1M
GPT-6 Sol1.1M

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 TerraGPT-6 Sol
CreatorOpenAIOpenAI
Released26 Oct 202622 Sept 2026
Weights——
ReasoningYesYes
Inputfile, image, textfile, image, text
Outputtexttext
Context window1.1M tokens1.1M tokens
Knowledge cutoff——
List price in / out per 1M$1 / $5$2 / $10
Blended price per 1M (3:1)$2.00$4.00
Cheapest hostOpenAI · $0.5 / $2.5OpenAI · $1 / $5
Hosts on OpenRouter23
Last tested27 Oct 202625 Oct 2026

Compare any two models →

GPT-6.1 Terra vs GPT-6 Sol: frequently asked questions

Is GPT-6.1 Terra better than GPT-6 Sol?
On accuracy they are statistically tied: GPT-6.1 Terra scored 73.8% and GPT-6 Sol 73.8% on the same 80 questions from open datasets. Similar accuracy; GPT-6.1 Terra costs less per question.
Which is cheaper, GPT-6.1 Terra or GPT-6 Sol?
GPT-6.1 Terra is cheaper: $0.0013 per question as billed, against $0.0024. List prices: GPT-6.1 Terra $1 in / $5 out, GPT-6 Sol $2 in / $10 out per million tokens.
Which is faster, GPT-6.1 Terra or GPT-6 Sol?
GPT-6.1 Terra is faster at 122 output tokens per second, against 92. Time to first token: 2.4 s for GPT-6.1 Terra, 0.9 s for GPT-6 Sol.
Which has the larger context window, GPT-6.1 Terra or GPT-6 Sol?
Both accept about the same amount of context: 1.1M and 1.1M tokens.