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Head-to-head comparison

GPT-5.3-Codex vs Grok 4.6

GPT-5.3-Codex (OpenAI) and Grok 4.6 (xAI) compared on the ModelCap Index, API price, context window, provider availability, weight access and every public benchmark board they share. Figures are the same ones shown on the live rankings; nothing here is a hidden score.

Snapshot as of 17 August 2026

As of 17 August 2026, Grok 4.6 holds the stronger ModelCap Index position (#10 vs #20); Grok 4.6 is 2.3× cheaper per output token ($6.00/1M vs $14.00/1M); and Grok 4.6 offers the longer context window (500K vs 400K tokens).

Which should you choose?

Choose GPT-5.3-Codex if…

  • your workload is prompt-heavy — input tokens cost $1.75/1M against $2.00/1M.
  • you want provider choice — 2 listed API providers against 1.

Choose Grok 4.6 if…

  • you want the stronger overall ModelCap Index position — #10 against #20 (74.4 vs 66.4 points).
  • API cost matters — $6.00/1M output tokens against $14.00/1M, about 2.3× cheaper.
  • you need the longer context window — 500K tokens against 400K.
  • Artificial Analysis Intelligence Index is your yardstick — 60.9 against 45.5.
  • you want the more recently listed model — Grok 4.6 was listed 12 August 2026, GPT-5.3-Codex 24 February 2026.

GPT-5.3-Codex vs Grok 4.6: specs, pricing and context

Specification comparison of GPT-5.3-Codex and Grok 4.6
FieldGPT-5.3-CodexOpenAIGrok 4.6xAI
ModelCap Index position#20#10
Index score66.474.4
EvidenceMeasuredMeasured
Input price / 1M tokens$1.75$2.00
Output price / 1M tokens$14.00$6.00
Context window400K tokens500K tokens
Max output tokens128K—
API providers listed21
Weight accessAPI onlyAPI only
Input modalitiesText, Image, FileText, Image, File
First listed24 February 202612 August 2026
PublisherOpenAIxAI

Evidence: 1 public benchmark observation across 1 board · 5 public benchmark observations across 5 boards. Prices are the lowest listed API offer per million tokens observed on the OpenRouter catalogue.

Benchmark scores: GPT-5.3-Codex vs Grok 4.6

Public benchmark boards where GPT-5.3-Codex or Grok 4.6 has a published result
BoardGPT-5.3-CodexGrok 4.6Leads
Arena codingArena (LMArena)—15121485–1538HighOnly one result
ARC-AGI-2ARC Prize Foundation—67.1%X-HighOnly one result
ARC-AGI-3ARC Prize Foundation—2.1%X-HighOnly one result
Artificial Analysis Intelligence IndexArtificial Analysis45.5intelligence-index60.9intelligence-indexGrok 4.6

Scores are the sources' own published figures for each model's best evaluated configuration; ModelCap never re-runs a benchmark.

Want a different pairing? Open the interactive comparison tool to swap either model for any current ranked language model.

GPT-5.3-Codex vs Grok 4.6: common questions

Is GPT-5.3-Codex better than Grok 4.6?

Grok 4.6 ranks higher on the ModelCap Index as of 17 August 2026: #10 against #20. That is a capability ranking built from public benchmark evidence with published uncertainty; whether it is "better" for you also depends on price, context and where you can run it.

Is GPT-5.3-Codex cheaper than Grok 4.6?

Grok 4.6 is cheaper on output tokens: $6.00/1M against $14.00/1M. Input tokens are $1.75/1M for GPT-5.3-Codex and $2.00/1M for Grok 4.6. Prices are the lowest listed API offer ModelCap observed, in USD per million tokens.

Which has the bigger context window, GPT-5.3-Codex or Grok 4.6?

Grok 4.6 has the larger context window: 500K tokens against 400K.

Which is better for coding, GPT-5.3-Codex or Grok 4.6?

The two models do not share a coding benchmark board on ModelCap yet, so no head-to-head coding score is published; the ModelCap Index position is the closest overall signal.

Are GPT-5.3-Codex and Grok 4.6 open-weight models?

GPT-5.3-Codex: API only. Grok 4.6: API only. Open weights mean the checkpoint can be downloaded and self-hosted under its licence; API-only models are available solely through hosted endpoints.

Where can I run GPT-5.3-Codex and Grok 4.6?

ModelCap currently lists 2 API providers for GPT-5.3-Codex and 1 for Grok 4.6, from the OpenRouter catalogue snapshot the site serves; each model page lists the providers and their prices.

How current is this GPT-5.3-Codex vs Grok 4.6 comparison?

Every figure comes from the sealed ModelCap dataset published 17 August 2026; the page re-renders within a minute of each data refresh, and the ModelCap Index positions are the same ones shown on the live rankings.

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