Compare AI models
| Specifications | ||
Context windowHow much information the model can work with in one request, measured in tokens — pieces of words or other data. This includes your question, attachments, conversation and reply. Limits can vary by model variant and provider. | 200k | 128k |
| These models have no shared benchmark scores. | ||
BullshitBench v2Nonsense detection — Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | 34% | — |
SWE-Bench VerifiedCoding — Real coding tasks pulled from open-source projects — the AI has to find and fix actual bugs. A human-checked version of the original SWE-Bench. Higher is better. | 72.5% | — |
GPQA DiamondScience — Graduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 79.6% | — |
| Overview | ||
| Company | Anthropic | OpenAI |
| Release date | May 22 2025 | Feb 12 2026 |
| Access | Closed | Closed |
| Model details | View model | View model |
Other comparisons
Claude Opus 4vsGemini 4 ArgonGPT-5.3-Codex-SparkvsGemini 4 ArgonClaude Opus 4vsMuse Spark OpenGPT-5.3-Codex-SparkvsMuse Spark OpenClaude Opus 4vsGrok 4.7GPT-5.3-Codex-SparkvsGrok 4.7Claude Opus 4vsDeepSeek-V4.1-Flash-1017GPT-5.3-Codex-SparkvsDeepSeek-V4.1-Flash-1017Claude Opus 4vsMistral Large 4GPT-5.3-Codex-SparkvsMistral Large 4Claude Opus 4vsKimi K3GPT-5.3-Codex-SparkvsKimi K3Frequently asked questions
Claude Opus 4 and GPT-5.3-Codex-Spark don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Claude Opus 4 shipped 266 days before GPT-5.3-Codex-Spark, so benchmark comparisons should account for the intervening progress.
Context windows are 200k (Claude Opus 4) vs 128k (GPT-5.3-Codex-Spark).
Direct benchmark comparisons are unavailable — Claude Opus 4 and GPT-5.3-Codex-Spark don't publish scores on any of the same benchmarks.