GPT-5.3 Codex vs Grok 4.6
Model Markets Rankings
Intelligence, Cost, and Efficiency
| Ranking | GPT-5.3-Codex | Grok 4.6 |
|---|---|---|
| IntelligenceHigher is better · MM Intelligence v1.2 | UnrankedNot in the 22-model eligible cohort | #13 of 2267.6 score |
| CostLower is better · Published-token output estimate | UnrankedNot in the 36-model eligible cohort | #18 of 36$0.097 per LiveBench case |
| EfficiencyHigher is better · MM Efficiency v1.0 | UnrankedNot in the 22-model eligible cohort | #8 of 2256.6 score |
Ranks come from the current complete eligible cohorts. Green highlights appear only when both models are ranked in the same metric. Missing required inputs remain unranked, and the three dimensions are not collapsed into an overall winner.
Benchmark Performance
Available Benchmarks
Technical Differences
Side-by-Side Facts
| Field | GPT-5.3-Codex | Grok 4.6 |
|---|---|---|
| Developer | OpenAI | xAI |
| Family | Gpt 5 3 | Grok 4 |
| Model | GPT-5.3-Codex | Grok 4.6 |
| Version | GPT-5.3-Codex | Grok 4.6 |
| Lifecycle | active | active |
| Released | Unknown | Unknown |
| Knowledge cutoff | 2025-08-31 | 2026-02-01 |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
| Context window | 400K | 500K |
| 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, tools |
14 comparable fields · 8 material differences · Pair passes the primary-source comparison gate
GPT-5.3 Codex Capabilities
Grok 4.6 Capabilities
Internal Comparison Graph
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Primary Evidence
Sources and Freshness
Questions
GPT-5.3 Codex vs Grok 4.6 FAQs
Is GPT-5.3 Codex or Grok 4.6 better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both GPT-5.3 Codex and Grok 4.6, 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 4.6?+
GPT-5.3 Codex is $1.75 and Grok 4.6 is $2.00 per million tokens, so GPT-5.3 Codex is cheaper on this metric. GPT-5.3 Codex is $14.00 and Grok 4.6 is $6.00 per million tokens, so Grok 4.6 is cheaper on this metric.
Which has a larger context window, GPT-5.3 Codex or Grok 4.6?+
Grok 4.6 has the larger sourced context window. GPT-5.3 Codex supports 400K and Grok 4.6 supports 500K.
Which performs better in benchmarks, GPT-5.3 Codex or Grok 4.6?+
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 4.6 be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. GPT-5.3 Codex is not marked open weight; Grok 4.6 is not marked open weight.
Can GPT-5.3 Codex and Grok 4.6 understand images?+
GPT-5.3 Codex is documented with image input; Grok 4.6 is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, GPT-5.3 Codex or Grok 4.6?+
Neither has a larger sourced maximum output. GPT-5.3 Codex is 128K and Grok 4.6 is —.
Do GPT-5.3 Codex and Grok 4.6 support reasoning and tool use?+
GPT-5.3 Codex: reasoning, tool calling, and image input. Grok 4.6: 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 4.6?+
GPT-5.3 Codex has 2 sourced provider routes; Grok 4.6 has 1, so GPT-5.3 Codex has broader tracked availability.
Which offers better value, GPT-5.3 Codex or Grok 4.6?+
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.