ResearchLLM Verifications Leaderboard

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

Head to head · tested 27 Oct 2026

Gemini 4 Argon vs GPT-5.3-Codex: accuracy, speed and price

Similar accuracy; Gemini 4 Argon costs less per question.

GoogleGemini 4 Argon83.8% score · #2$0.0062 per question69 tok/sOpenAIGPT-5.3-Codex82.5% score · #3$0.01 per question95 tok/s

Verdict

Built from the measurements below

  • Accuracy is too close to call: Gemini 4 Argon scored 83.8% and GPT-5.3-Codex 82.5% on the same 80 questions, a gap within what chance alone could produce.
  • Gemini 4 Argon is 1.7× cheaper per question as billed ($0.0062 vs $0.01), reasoning tokens included.
  • GPT-5.3-Codex generates text 1.4× faster: 95 tokens per second against 69.
  • GPT-5.3-Codex starts answering sooner: 1.4 s to the first token, against 3.3 s for Gemini 4 Argon.
  • Gemini 4 Argon accepts more context: 1M tokens against 400k.

Which should you choose?

Choose Gemini 4 Argon for the lower cost per correct answer ($0.0074 against $0.013) and a 1M-token context window. Choose GPT-5.3-Codex for faster streaming and a quicker first token. The widest subject gap is in law: Gemini 4 Argon answered 6 of 6 correctly, GPT-5.3-Codex 4 of 6. With so few questions per subject, treat this as a lead to test on your own prompts, not a result.

Accuracy gap +1.3 points (z = 0.21). 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

MeasureGemini 4 ArgonGPT-5.3-CodexEdge
Verification scoreHigher is better83.8%82.5%Too close to call
Cost per questionLower is better$0.0062$0.01Gemini 4 Argon
Output speedHigher is better6995GPT-5.3-Codex
Time to first tokenLower is better3.3 s1.4 sGPT-5.3-Codex
End-to-end response timeLower is better9.9 s5.2 sGPT-5.3-Codex
Tokens per questionLower is better558699Gemini 4 Argon
Context windowHigher is better1M400kGemini 4 Argon

Side by side

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

Every measure

Gemini 4 Argon first, GPT-5.3-Codex second

Verification scorehigher is better
Gemini 4 Argon83.8%
GPT-5.3-Codex82.5%
Cost per questionlower is better
Gemini 4 Argon$0.0062
GPT-5.3-Codex$0.01
Output speedhigher is better
Gemini 4 Argon69
GPT-5.3-Codex95
Time to first tokenlower is better
Gemini 4 Argon3.3 s
GPT-5.3-Codex1.4 s
End-to-end response timelower is better
Gemini 4 Argon9.9 s
GPT-5.3-Codex5.2 s
Tokens per questionlower is better
Gemini 4 Argon558
GPT-5.3-Codex699
Context windowhigher is better
Gemini 4 Argon1M
GPT-5.3-Codex400k

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

SpecificationGemini 4 ArgonGPT-5.3-Codex
CreatorGoogleOpenAI
Released13 Oct 202624 Feb 2026
Weights——
ReasoningYesYes
Inputaudio, file, image, text, videotext, image, file
Outputtexttext
Context window1M tokens400k tokens
Knowledge cutoff——
List price in / out per 1M$2 / $10$1.75 / $14
Blended price per 1M (3:1)$4.00$4.81
Cheapest hostGoogle AI Studio · $1 / $5Azure · $1.75 / $14
Hosts on OpenRouter22
Last tested25 Oct 202627 Oct 2026

Compare any two models →

Gemini 4 Argon vs GPT-5.3-Codex: frequently asked questions

Is Gemini 4 Argon better than GPT-5.3-Codex?
On accuracy they are statistically tied: Gemini 4 Argon scored 83.8% and GPT-5.3-Codex 82.5% on the same 80 questions from open datasets. Similar accuracy; Gemini 4 Argon costs less per question.
Which is cheaper, Gemini 4 Argon or GPT-5.3-Codex?
Gemini 4 Argon is cheaper: $0.0062 per question as billed, against $0.01. List prices: Gemini 4 Argon $2 in / $10 out, GPT-5.3-Codex $1.75 in / $14 out per million tokens.
Which is faster, Gemini 4 Argon or GPT-5.3-Codex?
GPT-5.3-Codex is faster at 95 output tokens per second, against 69. Time to first token: 3.3 s for Gemini 4 Argon, 1.4 s for GPT-5.3-Codex.
Which has the larger context window, Gemini 4 Argon or GPT-5.3-Codex?
Gemini 4 Argon, with 1M tokens against 400k.