GPT-OSS 120B vs DeepSeek V4 Pro
Benchmarks, API Token Pricing, Context Window & Speed Comparison
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GPT-OSS 120B by OpenAI and DeepSeek V4 Pro by DeepSeek represent two of the frontier AI models analyzed in our comprehensive 2026 AI benchmark and LLM comparison. In this head-to-head evaluation, we examine API token pricing, context window specifications, inference speed (tokens per second), and empirical reasoning performance. From a pure economic perspective, GPT-OSS 120B holds a notable pricing advantage for token ingestion. On output generation, GPT-OSS 120B is more economical per million generated tokens. In data-heavy architectures requiring extensive repository or document analysis, DeepSeek V4 Pro provides an expanded memory horizon with 1,000K tokens. In latency-sensitive production environments, GPT-OSS 120B leads in tokens-per-second throughput, making it ideal for real-time conversational agents and high-concurrency workflows. Below is the complete empirical head-to-head breakdown across cost, speed, context, and capability matrices.
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GPT-OSS 120B
Open HeavyweightA heavyweight open-weight GPT reasoning model that runs on a single GPU.
$0.15 / 1M
$0.60 / 1M
131.1K tokens
45.5%
DeepSeek V4 Pro
Agent BoostOfficial professional edition of V4 featuring a 390% jump in agentic execution capability and a frugal $0.67 task economic cost.
$1.32 / 1M
$3.96 / 1M
1M tokens
68.5%
Key Differences at a Glance
- GPT-OSS 120B is 7.3x cheaper for API usage (input + output tokens combined).
- DeepSeek V4 Pro has a larger context window (1M vs 131K tokens).
- GPT-OSS 120B is faster at 95 tok/s vs 80 tok/s.
- DeepSeek V4 Pro leads on SWE-bench coding (68.5% vs 45.5%).
| Feature | GPT-OSS 120B | DeepSeek V4 Pro |
|---|---|---|
Intelligence Index Composite reasoning & knowledge score (0-100) | 56 | 53 |
Provider | OpenAI | DeepSeek |
Input Price Cost per million input tokens | $0.15 / 1M | $1.32 / 1M |
Output Price Cost per million output tokens | $0.60 / 1M | $3.96 / 1M |
Blended Price Weighted 7:2:1 cache:input:output per 1M | $0.10 / 1M | $0.76 / 1M |
Context Window Maximum input + output tokens | 131.1K tokens~197 A4 pages of text | 1M tokens~1,500 A4 pages of text |
Max Output Tokens Per single request | 33K | 128K |
Throughput Speed Tokens generated per second | 95 tok/s | 80 tok/s |
SWE-bench Verified Real-world software engineering | 45.5% | 68.5% |
GPQA Diamond Graduate-level reasoning | 68.5% | 81.2% |
Cached Input Price Prompt caching discount per 1M tokens | $0.01 / 1M | $0.14 / 1M |
Who Wins Where?
At-a-glance decision frameworkEmpirical Head-to-Head Benchmark Scores
Official evaluation metrics verified by independent third-party research labs.
Industry benchmark evaluating real-world GitHub issue resolution and multi-file debugging.
Challenging questions created by domain experts to test complex PhD-level reasoning.
Hardened reasoning and academic knowledge benchmark with reduced lucky-guess probability.
Crowdsourced human preference evaluation based on blind, head-to-head model battles.
Extremely difficult, closed-ended questions spanning the frontier of human expert knowledge.
Autonomous multi-step tasks executed inside a real command-line terminal environment.
Research-grade coding problems drawn from real scientific and numerical workloads.
Contamination-free competitive programming problems collected continuously over time.
American Invitational Mathematics Examination — multi-step Olympiad-level reasoning.
Accuracy when reasoning over very large inputs that fill the model context window.
Tokens emitted per second during active generation streaming.
Latency & Response Time
Time to first token (TTFT) and estimated end-to-end response time for a typical 500-token response.
Real-Time Interactive Token Cost Simulator
Adjust sliders to calculate projected monthly cloud API spending with prompt caching discounts.
GPT-OSS 120B · Strengths & Key Advantages
- o4-mini-class performance with fully open weights
- Runs on a single high-memory GPU thanks to MoE routing
- Strong tool calling for self-hosted agents
- Near-o4-mini quality on private infrastructure
Considerations & Trade-offs
- Still behind proprietary frontier models on reasoning
- Text-only modality support
- Requires serious GPU memory to self-host
DeepSeek V4 Pro · Strengths & Key Advantages
- 390% measured leap in multi-turn autonomous agent execution stability
- Exceptional task economics with an average $0.67 cost per complex benchmark task
- Full 1M context input and 128K maximum output token generation
Considerations & Trade-offs
- Succeeded in raw architectural innovation by V4.1-Flash causal encoder-decoder design
- Pure text focus without native high-resolution visual processing
Token Use & Task Economics
Estimated cost and token consumption to complete one representative agentic task.
| Metric | GPT-OSS 120B | DeepSeek V4 Pro |
|---|---|---|
Cost per Task Estimated USD to finish one task | $0.14 | $0.67 |
Output Tokens / Task Tokens generated per task | 45K | 52K |
Reasoning Tokens / Task Thinking tokens burned per task | 22K | 25K |
Technical Specifications
Architecture, release timeline, capabilities, and modalities.
| Feature | GPT-OSS 120B | DeepSeek V4 Pro |
|---|---|---|
| Official API Model ID (SDK) | gpt-oss-120b | deepseek-reasoner |
| API Protocol | OpenAI Responses API & Chat Completions v1 | OpenAI-Compatible REST / vLLM / SGLang / HuggingFace TGI |
| Release Date | 2025-08 | 2026-08 |
| Knowledge Cutoff | June 2024 | May 2026 |
| Architecture | Sparse MoE transformer with reasoning | Next-Gen Sparse MoE with Agent RL Tuning |
| Parameters | 117B (5.1B active MoE) | MoE (Colossal) |
| Enterprise Rate Limits (RPM / TPM) | Unlimited (Hardware-bound on self-hosted GPU) / 10,000 RPM Cloud · Unlimited local throughput / 10M+ TPM Managed Cloud | Unlimited (Hardware-bound on self-hosted GPU) / 10,000 RPM Cloud · Unlimited local throughput / 10M+ TPM Managed Cloud |
| Long-Context Tier (>128K/200K) | Flat rate ($0.15/1M in) across full 131K window | Flat rate ($1.32/1M in) across full 1000K window |
| Prompt Cache Policy & TTL | Automatic prefix caching at $0.015/1M (no extra cache-write fee) | Automatic prefix caching at $0.14/1M (no extra cache-write fee) |
| Computer Use / GUI Agent | API / CLI Tool-Use & DOM Agent ready (no raw pixel desktop click loop) | API / CLI Tool-Use & DOM Agent ready (no raw pixel desktop click loop) |
| MCP & Parallel Tool Calling | Native MCP Client/Server ready · Parallel function calling · 100% Strict JSON Schema | Native MCP Client/Server ready · Parallel function calling · 100% Strict JSON Schema |
| Web Search Grounding & Sandbox | Native Web Search tool + Hosted Code Interpreter & File Search RAG | Supported via external Tavily/Exa Search & E2B/Docker Sandbox tools |
| Official Fine-Tuning Support | Full Weights SFT, LoRA, QLoRA, DPO & GRPO RL (Unsloth / Axolotl / Llama-Factory) | Full Weights SFT, LoRA, QLoRA, DPO & GRPO RL (Unsloth / Axolotl / Llama-Factory) |
| Multimodal Token Billing | Text BPE (~4 chars/token) | Text BPE (~4 chars/token) |
| Quantization & Min GPU VRAM | BF16 / FP16, FP8 Dynamic, INT4 AWQ / GPTQ, GGUF (Q4_K_M / Q8_0) · 73 GB VRAM (4-bit Quantized) · 252 GB VRAM (Native BF16) | BF16 / FP16, FP8 Dynamic, INT4 AWQ / GPTQ, GGUF (Q4_K_M / Q8_0) · 43 GB VRAM (4-bit Quantized) · 151 GB VRAM (Native BF16) |
| Safety & Frontier Classification | OpenAI Preparedness Framework Audited & System Card Published | Open-Weights System Card + Customizable Guardrail Layer (Llama Guard / ShieldGemma) |
| Enterprise Compliance (ZDR/HIPAA/SOC2) | 100% Air-Gapped On-Premises / Private VPC · Full HIPAA, GDPR & SOC2 Control | 100% Air-Gapped On-Premises / Private VPC · Full HIPAA, GDPR & SOC2 Control |
| Input Modalities | text | text |
| Output Modalities | text | text |
GPT-OSS 120B vs DeepSeek V4 Pro: Quick Answers
Which is more intelligent, GPT-OSS 120B or DeepSeek V4 Pro?
GPT-OSS 120B is more intelligent. It scores 56 compared with 53 on the composite Intelligence Index.
Which model is faster?
GPT-OSS 120B is faster, generating 95 tokens per second compared with 80 tokens per second.
Which model is cheaper to run?
GPT-OSS 120B is cheaper at $0.10 per 1M tokens blended, compared with $0.76 (7:2:1 cache:input:output ratio).
Which model has lower latency?
GPT-OSS 120B has lower latency, with a time to first token of 0.48s compared with 0.58s.
Which model has a larger context window?
DeepSeek V4 Pro has a larger context window, supporting 1M tokens compared with 131.1K tokens.
Verdict
Verdict & Model Selection Recommendation: Choose GPT-OSS 120B if your priority is Self-hosted agents that need near-frontier quality on private data. Its performance in demanding tasks justifies its operational token cost. Choose DeepSeek V4 Pro if your workflow prioritizes Autonomous agent swarms, continuous code refactoring pipelines, and enterprise automation. For large-scale batch processing or customer-facing conversational interfaces, its balance of speed and economics delivers superior ROI.
Frequently asked questions
How does GPT-OSS 120B compare to DeepSeek V4 Pro in API token pricing and cost per token?+
GPT-OSS 120B costs $0.15 per 1M input tokens and $0.60 per 1M output tokens, whereas DeepSeek V4 Pro costs $1.32 input and $3.96 output. Overall, GPT-OSS 120B is the more cost-effective model for high-volume API pipelines. Both models support prompt caching discounts of up to 90% for repeated prompt prefixes.
Which model has a larger context window: GPT-OSS 120B or DeepSeek V4 Pro?+
GPT-OSS 120B supports a context window of 131K tokens (~98k words), while DeepSeek V4 Pro supports 1,000K tokens (~750k words). Therefore, DeepSeek V4 Pro can process more textual data and document context in a single prompt.
Which AI model is better for software engineering and coding: GPT-OSS 120B or DeepSeek V4 Pro?+
GPT-OSS 120B scores 45.5% on SWE-bench Verified while DeepSeek V4 Pro scores 68.5%. For autonomous software engineering and multi-file debugging, DeepSeek V4 Pro holds the verified benchmark lead.
What is the difference in reasoning capability and extended thinking between GPT-OSS 120B and DeepSeek V4 Pro?+
GPT-OSS 120B features native chain-of-thought extended thinking mode with configurable reasoning effort. In contrast, DeepSeek V4 Pro provides chain-of-thought reasoning depth for complex math and science.
How does inference speed (tokens per second) compare between GPT-OSS 120B and DeepSeek V4 Pro?+
GPT-OSS 120B generates approximately 95 tokens per second, while DeepSeek V4 Pro delivers 80 tokens per second. In latency-sensitive production environments, GPT-OSS 120B provides faster time-to-first-token (TTFT) and higher streaming response velocity.
Can you implement a tiered LLM routing setup combining GPT-OSS 120B and DeepSeek V4 Pro to optimize costs?+
Yes! High-efficiency architectures route high-frequency routine classification and conversational tasks to GPT-OSS 120B to save operational costs, and dynamically escalate complex architectural queries or reasoning tasks to DeepSeek V4 Pro. This tiered routing pattern cuts overall API bills by up to 70%.
Understand key metrics like context window, token pricing, reasoning mode, and SWE-bench scores in our comprehensive AI glossary.
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Benchmark scores, token prices, and rate limits evolve rapidly as AI labs release model updates. Always verify current specifications and pricing on the official provider documentation.
Sources: GetInfoUs Independent AI Benchmarks & Official API Specs