GPT-5.1 Chat vs GPT-5 Pro
| Signal | GPT-5.1 Chat | Delta | GPT-5 Pro |
|---|---|---|---|
Capabilities | 83 | -17 | |
Benchmarks | 88 | +1 | |
Pricing | 90 | +85 | |
Context window size | 73 | -7 | |
Recency | 89 | +7 | |
Output Capacity | 75 | -10 | |
| Overall Result | 3 wins | of 6 | 3 wins |
Score History
88.2
current score
Tied
right now
88.2
current score
GPT-5.1 Chat
OpenAI
GPT-5 Pro
OpenAI
GPT-5.1 Chat saves you $6875.00/month
That's $82500.00/year compared to GPT-5 Pro at your current usage level of 100K calls/month.
| Metric | GPT-5.1 Chat | GPT-5 Pro | Winner |
|---|---|---|---|
| Overall Score | 88 | 88 | -- |
| Rank | #30 | #32 | GPT-5.1 Chat |
| Quality Rank | #30 | #32 | GPT-5.1 Chat |
| Adoption Rank | #30 | #32 | GPT-5.1 Chat |
| Parameters | -- | -- | -- |
| Context Window | 128K | 400K | GPT-5 Pro |
| Pricing | $1.25/$10.00/M | $15.00/$120.00/M | -- |
| Signal Scores | |||
| Capabilities | 83 | 100 | GPT-5 Pro |
| Benchmarks | 88 | 88 | GPT-5.1 Chat |
| Pricing | 90 | 5 | GPT-5.1 Chat |
| Context window size | 73 | 80 | GPT-5 Pro |
| Recency | 89 | 82 | GPT-5.1 Chat |
| Output Capacity | 75 | 85 | GPT-5 Pro |
Our score (0-100) is driven by benchmark performance (90%) from Arena Elo ratings, MMLU, GPQA, HumanEval, SWE-bench, and 15+ standardized evaluations. Capabilities and context window serve as tiebreakers (10%). Learn more about our methodology.
Scores 88/100 (rank #30), placing it in the top 90% of all 290 models tracked.
Scores 88/100 (rank #32), placing it in the top 89% of all 290 models tracked.
With only a 0-point gap, these models are in the same performance tier. The practical difference in output quality is minimal - your choice should depend on pricing, latency requirements, and specific feature needs.
Choose GPT-5.1 Chat when you need:
- High-volume production workloads where API costs must be minimized
Choose GPT-5 Pro when you need:
- Processing long documents or large codebases (400K token context)
- Step-by-step reasoning and chain-of-thought problem solving
GPT-5.1 Chat offers 92% better value per quality point. At 1M tokens/day, you'd spend $168.75/month with GPT-5.1 Chat vs $2025.00/month with GPT-5 Pro - a $1856.25 monthly difference.
Both models have comparable response speeds. For most applications, the latency difference is negligible.
When latency matters most: Interactive chatbots, IDE code completion, real-time translation, and user-facing applications where response time directly impacts experience. For batch processing, background summarization, or offline analysis, latency is less critical.
Code generation & review
Based on overall model capabilities and architecture for coding tasks like generating functions, debugging, and refactoring
Customer support chatbot
Suitable for user-facing chat with competitive response times. GPT-5.1 Chat also offers lower per-token costs for high-volume support
Long document analysis
Larger context window (400K tokens) can process longer documents, contracts, and research papers in a single pass
Batch data extraction
Lower output pricing ($10.00/M) reduces costs when processing thousands of records daily
Creative writing & content
Higher overall composite score (88/100) correlates with better nuance, coherence, and style in long-form content
Image understanding & OCR
Supports vision input - can analyze screenshots, diagrams, photos, and scanned documents directly
GPT-5.1 Chat and GPT-5 Pro are extremely close in overall performance (only 0 points apart). Your best choice depends entirely on which specific strengths matter most for your use case.
By Use Case
Best for Quality
GPT-5.1 Chat
Marginally better benchmark scores; both are excellent
Best for Cost
GPT-5.1 Chat
92% lower pricing; better value at scale
Best for Reliability
GPT-5.1 Chat
Higher uptime and faster response speeds
Best for Prototyping
GPT-5.1 Chat
Stronger community support and better developer experience
Best for Production
GPT-5.1 Chat
Wider enterprise adoption and proven at scale
by OpenAI
- Choose for Quality - Marginally better benchmark scores; both are excellent
- Choose for Cost - 92% lower pricing; better value at scale
- Choose for Reliability - Higher uptime and faster response speeds
- Choose for Prototyping - Stronger community support and better developer experience
- Choose for Production - Wider enterprise adoption and proven at scale
| Capability | GPT-5.1 Chat | GPT-5 Pro |
|---|---|---|
| Vision (Image Input) | ||
| Function Calling | ||
| Streaming | ||
| JSON Mode | ||
| Reasoningdiffers | ||
| Web Search | ||
| Image Output |
GPT-5.1 Chat
OpenAI
GPT-5 Pro
OpenAI
GPT-5.1 Chat saves you $156.75/month
That's 92% cheaper than GPT-5 Pro at 1,000 tokens/request and 100 requests/day.
Assumes 60% input / 40% output token ratio per request. Actual costs may vary based on your usage pattern.
| Parameter | GPT-5.1 Chat | GPT-5 Pro |
|---|---|---|
| Context Window | 128K | 400K |
| Max Output Tokens | 32,000 | 128,000 |
| Open Source | No | No |
| Created | Nov 13, 2025 | Oct 6, 2025 |