ResearchLLM Verifications Leaderboard

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

Head to head · tested 27 Oct 2026

GPT-5.3-Codex vs Grok 4.7: accuracy, speed and price

Similar accuracy; GPT-5.3-Codex costs less per question.

OpenAIGPT-5.3-Codex82.5% score · #3$0.01 per question95 tok/sSpaceXAIGrok 4.780.0% score · #6$0.025 per question77 tok/s

Verdict

Built from the measurements below

  • Accuracy is too close to call: GPT-5.3-Codex scored 82.5% and Grok 4.7 80.0% on the same 80 questions, a gap within what chance alone could produce.
  • GPT-5.3-Codex is 2.4× cheaper per question as billed ($0.01 vs $0.025), reasoning tokens included.
  • GPT-5.3-Codex generates text 1.2× faster: 95 tokens per second against 77.
  • GPT-5.3-Codex starts answering sooner: 1.4 s to the first token, against 1.9 s for Grok 4.7.
  • Grok 4.7 accepts more context: 500k tokens against 400k.

Which should you choose?

Choose GPT-5.3-Codex for the lower cost per correct answer ($0.013 against $0.031), faster streaming, a quicker first token and shorter outputs (about 699 tokens per question against 3,952). Choose Grok 4.7 for a 500k-token context window.

Accuracy gap +2.5 points (z = 0.41). 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-5.3-CodexGrok 4.7Edge
Verification scoreHigher is better82.5%80.0%Too close to call
Cost per questionLower is better$0.01$0.025GPT-5.3-Codex
Output speedHigher is better9577GPT-5.3-Codex
Time to first tokenLower is better1.4 s1.9 sGPT-5.3-Codex
End-to-end response timeLower is better5.2 s8.0 sGPT-5.3-Codex
Tokens per questionLower is better6993,952GPT-5.3-Codex
Context windowHigher is better400k500kGrok 4.7

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-5.3-Codex first, Grok 4.7 second

Verification scorehigher is better
GPT-5.3-Codex82.5%
Grok 4.780.0%
Cost per questionlower is better
GPT-5.3-Codex$0.01
Grok 4.7$0.025
Output speedhigher is better
GPT-5.3-Codex95
Grok 4.777
Time to first tokenlower is better
GPT-5.3-Codex1.4 s
Grok 4.71.9 s
End-to-end response timelower is better
GPT-5.3-Codex5.2 s
Grok 4.78.0 s
Tokens per questionlower is better
GPT-5.3-Codex699
Grok 4.73,952
Context windowhigher is better
GPT-5.3-Codex400k
Grok 4.7500k

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-5.3-CodexGrok 4.7
CreatorOpenAISpaceXAI
Released24 Feb 202621 Sept 2026
Weights——
ReasoningYesYes
Inputtext, image, filetext, image, file
Outputtexttext
Context window400k tokens500k tokens
Knowledge cutoff——
List price in / out per 1M$1.75 / $14$2 / $6
Blended price per 1M (3:1)$4.81$3.00
Cheapest hostAzure · $1.75 / $14xAI · $2 / $6
Hosts on OpenRouter21
Last tested27 Oct 202627 Oct 2026

Compare any two models →

GPT-5.3-Codex vs Grok 4.7: frequently asked questions

Is GPT-5.3-Codex better than Grok 4.7?
On accuracy they are statistically tied: GPT-5.3-Codex scored 82.5% and Grok 4.7 80.0% on the same 80 questions from open datasets. Similar accuracy; GPT-5.3-Codex costs less per question.
Which is cheaper, GPT-5.3-Codex or Grok 4.7?
GPT-5.3-Codex is cheaper: $0.01 per question as billed, against $0.025. List prices: GPT-5.3-Codex $1.75 in / $14 out, Grok 4.7 $2 in / $6 out per million tokens.
Which is faster, GPT-5.3-Codex or Grok 4.7?
GPT-5.3-Codex is faster at 95 output tokens per second, against 77. Time to first token: 1.4 s for GPT-5.3-Codex, 1.9 s for Grok 4.7.
Which has the larger context window, GPT-5.3-Codex or Grok 4.7?
Grok 4.7, with 500k tokens against 400k.