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GPT-5.6 Terra Pro vs DeepSeek V3.1

Detailed technical comparison between GPT-5.6 Terra Pro (OpenAI) and DeepSeek V3.1 (DeepSeek). Review live API token pricing, context window capabilities, time-to-first-token latency, and verified benchmark scores side-by-side.

⚡ Executive Summary & Verdict

Comparison Snapshot

GPT-5.6 Terra Pro: 6 WinsvsDeepSeek V3.1: 0 Wins
Context Leader

GPT-5.6 Terra Pro

1,050,000 tokens
Agentic Tool-Calling

Tie

Equal Capability
Lowest Latency (TTFT)

Tie

Equal Speed
Input Price Leader

DeepSeek V3.1

$0.25 / MTok
OpenAIactive

GPT-5.6 Terra Pro

GPT-5.6 Terra Pro is the same underlying model as [GPT-5.6 Terra](https://openrouter.ai/openai/gpt-5.6-terra), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode

View GPT-5.6 Terra Pro Full Specs →
DeepSeekactive

DeepSeek V3.1

DeepSeek-V3.1 is a large hybrid reasoning model (671B parameters, 37B active) that supports both thinking and non-thinking modes via prompt templates. It extends the DeepSeek-V3 base with a two-phase long-context...

View DeepSeek V3.1 Full Specs →

Technical Specifications

🏆 = Superior Spec
SpecificationGPT-5.6 Terra ProDeepSeek V3.1
ProviderOpenAIDeepSeek
Context Window1,050,000 tokens🏆163,840 tokens
Agent SuitabilityNot yet benchmarkedNot yet benchmarked
Time to First Token (TTFT)No public TTFT dataNo public TTFT data
Deployment Modelmanaged apiself hostable
Production StabilityBeta Access (est.)Stable GA (est.)
API AvailableYesYes
Released Date2026-07-092025-08-21

API Pricing Comparison

Input Price per Million Tokens

GPT-5.6 Terra Pro

$2.50

DeepSeek V3.1

$0.25

Output Price per Million Tokens

GPT-5.6 Terra Pro

$15.00

DeepSeek V3.1

$0.95

💡 Cost Ratio: DeepSeek V3.1 is 10.0x cheaper per input token than GPT-5.6 Terra Pro.

Want to test both models live?

Run side-by-side prompt benchmarks in our dynamic multi-model Sandbox. Compare execution speeds, latency metrics, and compute actual costs in real-time.

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Benchmark Performance Metrics

Standardized Scores (0–100%)

Scores show verified raw accuracy percentages across standardized AI evaluation suites. Higher bars indicate superior performance in that domain.

MMLUGeneral knowledge & multi-task understanding
90.8%vs80.0%+10.8% GPT-5.6 Terra Pro
GPT-5.6 Terra Pro 🏆
DeepSeek V3.1
HumanEvalPython coding & logic synthesis
92.0%vs78.2%+13.8% GPT-5.6 Terra Pro
GPT-5.6 Terra Pro 🏆
DeepSeek V3.1
MATHComplex mathematical problem solving
79.2%vs55.4%+23.8% GPT-5.6 Terra Pro
GPT-5.6 Terra Pro 🏆
DeepSeek V3.1
GPQAGraduate-level expert reasoning
57.6%vs40.8%+16.8% GPT-5.6 Terra Pro
GPT-5.6 Terra Pro 🏆
DeepSeek V3.1
HellaSwagCommonsense reasoning and inference
89.8%vs83.0%+6.8% GPT-5.6 Terra Pro
GPT-5.6 Terra Pro 🏆
DeepSeek V3.1
MT-BenchMulti-turn conversation flow quality
9.2%vs8.6%+0.7% GPT-5.6 Terra Pro
GPT-5.6 Terra Pro 🏆
DeepSeek V3.1

GPT-5.6 Terra Pro Quirks & Gotchas

No developer gotchas reported.

DeepSeek V3.1 Quirks & Gotchas

No developer gotchas reported.

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