GPT-5.5 vs DeepSeek V4 Pro
Rank, tier, score and price side by side, from our weekly rankings. Scores are editorial opinion based on public sources.
A
GPT-5.5
B
DeepSeek V4 Pro
- ProviderOpenAIDeepSeek
- Rank#23Higher rank#30
- TierAA
- Score84.0Higher score83.0
- PriceAPI $5 input / $30 output per 1M tokensAPI $1.32 input / $3.96 output per 1M tokens at peak hours ($0.66 / $1.98 off-peak); MIT open weightsLower price tier
- TaglineOpenAI's April 2026 flagship for complex professional and agentic coding work, since followed by the GPT-5.6 family (July 2026) and GPT-6 Astra (September 2026).MIT-licensed open-weight heavyweight, among the open-weight leaders on SWE-bench Verified and LiveCodeBench.
| Attribute | GPT-5.5 | DeepSeek V4 Pro |
|---|---|---|
| Provider | OpenAI | DeepSeek |
| Rank | #23Higher rank | #30 |
| Tier | A | A |
| Score | 84.0Higher score | 83.0 |
| Price | API $5 input / $30 output per 1M tokens | API $1.32 input / $3.96 output per 1M tokens at peak hours ($0.66 / $1.98 off-peak); MIT open weightsLower price tier |
| Tagline | OpenAI's April 2026 flagship for complex professional and agentic coding work, since followed by the GPT-5.6 family (July 2026) and GPT-6 Astra (September 2026). | MIT-licensed open-weight heavyweight, among the open-weight leaders on SWE-bench Verified and LiveCodeBench. |