GPT-5
OpenAI·Aug 2025reasoningproprietary
70.7
modhub Index
GPT-5 unified OpenAI's general-purpose and reasoning model families into a single system with selectable reasoning effort (minimal to high). At launch it set state-of-the-art results on math (94.6% on AIME 2025) and strong agentic coding numbers, while pricing aggressively at $1.25 per million input tokens. Later 5.x releases superseded it at the frontier, but GPT-5 remains widely deployed and well understood in production.
Benchmark results
Where it shines
- Proven, widely deployed production model
- Strong math and reasoning for its price class
- Same price as GPT-5.1 with stable, documented behavior
Alternatives to GPT-5
Google's 2025 workhorse flagship — first mainstream thinking model with a 1M context, still widely deployed.
The sparse-attention release that halved DeepSeek's already-lowest-in-class prices while keeping GPT-class quality.
Google's November 2025 frontier breakout — 91.9% GPQA Diamond and 37.5% HLE made it the reasoning leader of its generation.
A trillion-parameter open reasoning agent that can chain 200–300 tool calls — the open-weights agentic standout of late 2025.
Frequently asked questions
- How much does the GPT-5 API cost?
- GPT-5 costs $1.25 per million input tokens and $10 per million output tokens, with cached input at $0.13 per million. A workload of 10M input and 1.5M output tokens per month costs about $27.50.
- What is the context window of GPT-5?
- GPT-5 supports a context window of 400,000 tokens (400K), with up to 128K output tokens per response.
- Is GPT-5 open source?
- No — GPT-5 is a proprietary model available through OpenAI's API and partner platforms.
- What are the best alternatives to GPT-5?
- The closest alternatives by overall capability are Gemini 2.5 Pro, DeepSeek V3.2, Gemini 3 Pro, Kimi K2 Thinking. See the comparison pages for detailed head-to-head breakdowns.