Compare AI models
| Specifications | ||
ParametersThe learned values that shape how a model responds. B means billion and T means trillion. For mixture-of-experts models, the total count is larger than the number active for each token. Parameter count alone does not measure quality. | 671B | — |
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. | 128k | 400k |
| API pricingUSD per 1M tokens · lower wins | ||
Cheapest inputLowest input rate across every provider on OpenRouter, the lab included. The cheapest endpoint may run a quantised build or a shorter context — see "Available from" on the model page. | $0.50DeepInfra | — |
Cheapest outputLowest output rate across every provider on OpenRouter, the lab included. May come from a different provider than the cheapest input. | $2.15DeepInfra | — |
| $208DeepInfra · fp4 | — | |
| Benchmarks | ||
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. | 8% | 32% |
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. | 57.6% | — |
LiveCodeBenchCompetitive coding — Coding problems published so recently the AI can't have seen them in training — a contamination-free test of raw programming skill. Higher is better. | 73.3% | — |
Humanity's Last Exam · with toolsMultidisciplinary reasoning — Humanity's Last Exam — extremely hard expert questions across many subjects. “With tools” means the AI is allowed to search the web or run code while answering. Higher is better. | 17.7% | — |
GPQA DiamondScience — Graduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 81% | — |
| Overview | ||
| Company | DeepSeek | OpenAI |
| Release date | May 28 2025 | Nov 13 2025 |
| Access | Open Weight | Closed |
| Model details | View model | View model |
Other comparisons
DeepSeek R1-0528vsClaude Fable 5.2GPT-5.1-CodexvsClaude Fable 5.2DeepSeek R1-0528vsGemini 4 CarbonGPT-5.1-CodexvsGemini 4 CarbonDeepSeek R1-0528vsMuse EmberGPT-5.1-CodexvsMuse EmberDeepSeek R1-0528vsGrok 4.7GPT-5.1-CodexvsGrok 4.7DeepSeek R1-0528vsMistral Large 4GPT-5.1-CodexvsMistral Large 4DeepSeek R1-0528vsKimi K3.1 ProGPT-5.1-CodexvsKimi K3.1 ProFrequently asked questions
GPT-5.1-Codex leads DeepSeek R1-0528 on 1 of the 1 benchmark they both report (BullshitBench v2). DeepSeek R1-0528 shipped 169 days before GPT-5.1-Codex, so benchmark comparisons should account for the intervening progress.
Context windows are 128k (DeepSeek R1-0528) vs 400k (GPT-5.1-Codex). DeepSeek R1-0528 is open weight, while GPT-5.1-Codex is closed.
On BullshitBench v2, GPT-5.1-Codex leads at 32% vs DeepSeek R1-0528 at 8%.