Compare AI models
| Specifications | ||
Context windowHow much text the model can hold in mind at once — your question, any documents you attach, the conversation so far, and its own reply. Go past it and the earliest part falls out of view. | 128k | — |
| Overview | ||
| Company | OpenAI | SpaceXAI |
| Release date | Feb 12 2026 | Mar 29 2024 |
| Access | Closed | Closed |
| Model details | View model | View model |
Other comparisons
GPT-5.3-Codex-SparkvsClaude Sonnet 5.5Grok‑1.5vsClaude Sonnet 5.5GPT-5.3-Codex-SparkvsGemini 4 ArgonGrok‑1.5vsGemini 4 ArgonGPT-5.3-Codex-SparkvsMuse Spark 1.3Grok‑1.5vsMuse Spark 1.3GPT-5.3-Codex-SparkvsDeepSeek-V4.1-FlashGrok‑1.5vsDeepSeek-V4.1-FlashGPT-5.3-Codex-SparkvsMistral Large 4Grok‑1.5vsMistral Large 4GPT-5.3-Codex-SparkvsKimi K3Grok‑1.5vsKimi K3Frequently asked questions
GPT-5.3-Codex-Spark and Grok‑1.5 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Grok‑1.5 shipped 685 days before GPT-5.3-Codex-Spark, so benchmark comparisons should account for the intervening progress.
Published specifications for these two models are limited — see each model page for the latest details.
Direct benchmark comparisons are unavailable — GPT-5.3-Codex-Spark and Grok‑1.5 don't publish scores on any of the same benchmarks.