GPT-5.3 Codex vs Grok Build 0.1
At a Glance
| Compare |  GPT-5.3 CodexOpenAI | |
|---|---|---|
| Intelligence, Cost, and Efficiency | ||
| IntelligenceHigher is better · MM Intelligence v4.4 | UnrankedNot in the 57-model eligible cohort | #34 of 5725.1 score · 1/3 sources · single-source provisional · missing ARC-AGI-2, LMArena Text · full-core range 8.4–75.0 |
| CostLower is better · Published-token output estimate | UnrankedNot in the 27-model eligible cohort | #1 of 27$0.0020 per LiveBench case |
| EfficiencyHigher is better · MM Efficiency v1.9 | UnrankedNot in the 27-model eligible cohort | #4 of 2762.5 score · 1/3 sources · single-source provisional · missing ARC-AGI-2, LMArena Text · full-core range 54.2–87.5 |
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | $1.75Openai ↗ · Sep 3, 2026 | $1.00Xai ↗ · Sep 3, 2026 |
| Output priceFrom · USD / 1M tokens | $14.00Openai ↗ · Sep 3, 2026 | $2.00Xai ↗ · Sep 3, 2026 |
| Context windowMaximum documented tokens | 400K | 256K |
| Model facts checked | Sep 3, 2026View model evidence → | Sep 3, 2026View model evidence → |
Token prices are the lowest available sourced USD rates; input and output may use different providers. Cost ranking estimates output spend on LiveBench, not a full request bill. Ranking methodology →
Available Benchmarks
Side-by-Side Facts
| Field | GPT-5.3-Codex | Grok Build 0.1 |
|---|---|---|
| Developer | OpenAI | xAI |
| Family | Gpt 5 3 | Grok Build |
| Model | GPT-5.3-Codex | Grok Build 0.1 |
| Version | GPT-5.3-Codex | Grok Build 0.1 |
| Lifecycle | active | preview |
| Released | Unknown | 2026-05-29 |
| Knowledge cutoff | 2025-08-31 | Unknown |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
| Context window | 400K | 256K |
| Total parameters | Unknown | Unknown |
| Active parameters | Unknown | Unknown |
| License | Unknown | Unknown |
| Open weights | No | No |
| API available | Yes | Yes |
| Self-hostable | No | No |
| Provider access | Openai (Standard), Openrouter (Standard) | Xai (Standard) |
| Capabilities | chat, generation, reasoning, structured_outputs, tools | chat, generation, reasoning, structured_outputs, tools |
GPT-5.3 Codex Capabilities
Grok Build 0.1 Capabilities
Related Comparisons
All image comparisons →| A | Pair | B | Context |
|---|---|---|---|
GPT-5.3-CodexOpenAI | vs | Grok 4.6xAI | cross-developer peersimage, text |
 Gemini 3.8 FlashGoogle DeepMind | vs | GPT-5.3-CodexOpenAI | cross-developer peerstext |
Claude Opus 4.5Anthropic | vs | GPT-5.3-CodexOpenAI | cross-developer peersimage, text |
Seed 2.1 EvolvingByteDance Seed | vs | GPT-5.3-CodexOpenAI | cross-developer peersimage, text |
Antigravity AgentGoogle DeepMind | vs | GPT-5.3-CodexOpenAI | cross-developer peerstext |
Gemini Computer UseGoogle DeepMind | vs | GPT-5.3-CodexOpenAI | cross-developer peerstext |
Gemma 4 31BGoogle DeepMind | vs | GPT-5.3-CodexOpenAI | cross-developer peersimage, text |
GPT-5 NanoOpenAI | vs | GPT-5.3-CodexOpenAI | family variantsimage, text |
GPT-5.3-CodexOpenAI | vs | GPT-5.4OpenAI | family variantsimage, text |
GPT-5.3-CodexOpenAI | vs | GPT-5.4 NanoOpenAI | family variantsimage, text |
Primary Evidence
Sources and Freshness
Questions
GPT-5.3 Codex vs Grok Build 0.1 FAQs
Is GPT-5.3 Codex or Grok Build 0.1 better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both GPT-5.3 Codex and Grok Build 0.1, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, GPT-5.3 Codex or Grok Build 0.1?+
GPT-5.3 Codex is $1.75 and Grok Build 0.1 is $1.00 per million tokens, so Grok Build 0.1 is cheaper on this metric. GPT-5.3 Codex is $14.00 and Grok Build 0.1 is $2.00 per million tokens, so Grok Build 0.1 is cheaper on this metric.
Which has a larger context window, GPT-5.3 Codex or Grok Build 0.1?+
GPT-5.3 Codex has the larger sourced context window. GPT-5.3 Codex supports 400,000 tokens and Grok Build 0.1 supports 256,000 tokens.
Which performs better in benchmarks, GPT-5.3 Codex or Grok Build 0.1?+
There is no overall benchmark winner: At least two independently verified, protocol-matched benchmarks are required for an overall winner.
Can GPT-5.3 Codex or Grok Build 0.1 be self-hosted?+
Both models have the same sourced self-hosting status: unsupported. GPT-5.3 Codex is not marked open weight; Grok Build 0.1 is not marked open weight.
Can GPT-5.3 Codex and Grok Build 0.1 understand images?+
GPT-5.3 Codex is documented with image input; Grok Build 0.1 is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, GPT-5.3 Codex or Grok Build 0.1?+
GPT-5.3 Codex has a sourced maximum output of 128,000 tokens; Grok Build 0.1's maximum output is not reported. A larger limit cannot be determined.
Do GPT-5.3 Codex and Grok Build 0.1 support reasoning and tool use?+
GPT-5.3 Codex: reasoning, tool calling, and image input. Grok Build 0.1: reasoning, tool calling, and image input. Feature support does not establish relative quality.
Which is available from more inference providers, GPT-5.3 Codex or Grok Build 0.1?+
GPT-5.3 Codex has 2 sourced provider routes; Grok Build 0.1 has 1, so GPT-5.3 Codex has broader tracked availability.
Which offers better value, GPT-5.3 Codex or Grok Build 0.1?+
There is no universal value winner. Compare the input and output prices above with the matched benchmark result for your workload: cheaper tokens can be offset by different quality, token usage, latency, or provider availability.