Gemini 3 Flash Preview vs GPT-5.1-Codex-Mini
| Signal | Gemini 3 Flash Preview | Delta | GPT-5.1-Codex-Mini |
|---|---|---|---|
Capabilities | 100 | -- | |
Benchmarks | 87 | -2 | |
Pricing | 97 | -1 | |
Context window size | 86 | +6 | |
Recency | 95 | +6 | |
Output Capacity | 80 | -3 | |
| Overall Result | 2 wins | of 6 | 3 wins |
Score History
88
current score
Gemini 3 Flash Preview
right now
87.4
current score
Gemini 3 Flash Preview
GPT-5.1-Codex-Mini
OpenAI
GPT-5.1-Codex-Mini saves you $75.00/month
That's $900.00/year compared to Gemini 3 Flash Preview at your current usage level of 100K calls/month.
| Metric | Gemini 3 Flash Preview | GPT-5.1-Codex-Mini | Winner |
|---|---|---|---|
| Overall Score | 88 | 87 | Gemini 3 Flash Preview |
| Rank | #36 | #38 | Gemini 3 Flash Preview |
| Quality Rank | #36 | #38 | Gemini 3 Flash Preview |
| Adoption Rank | #36 | #38 | Gemini 3 Flash Preview |
| Parameters | -- | -- | -- |
| Context Window | 1049K | 400K | Gemini 3 Flash Preview |
| Pricing | $0.50/$3.00/M | $0.25/$2.00/M | -- |
| Signal Scores | |||
| Capabilities | 100 | 100 | Gemini 3 Flash Preview |
| Benchmarks | 87 | 88 | GPT-5.1-Codex-Mini |
| Pricing | 97 | 98 | GPT-5.1-Codex-Mini |
| Context window size | 86 | 80 | Gemini 3 Flash Preview |
| Recency | 95 | 89 | Gemini 3 Flash Preview |
| Output Capacity | 80 | 83 | GPT-5.1-Codex-Mini |
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 #36), placing it in the top 88% of all 290 models tracked.
Scores 87/100 (rank #38), placing it in the top 87% of all 290 models tracked.
With only a 1-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 Gemini 3 Flash Preview when you need:
- Processing long documents or large codebases (1049K token context)
- Step-by-step reasoning and chain-of-thought problem solving
Choose GPT-5.1-Codex-Mini when you need:
- High-volume production workloads where API costs must be minimized
- Step-by-step reasoning and chain-of-thought problem solving
GPT-5.1-Codex-Mini offers 36% better value per quality point. At 1M tokens/day, you'd spend $33.75/month with GPT-5.1-Codex-Mini vs $52.50/month with Gemini 3 Flash Preview - a $18.75 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-Codex-Mini also offers lower per-token costs for high-volume support
Long document analysis
Larger context window (1049K tokens) can process longer documents, contracts, and research papers in a single pass
Batch data extraction
Lower output pricing ($2.00/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
Gemini 3 Flash Preview and GPT-5.1-Codex-Mini are extremely close in overall performance (only 0.5999999999999943 points apart). Your best choice depends entirely on which specific strengths matter most for your use case.
By Use Case
Best for Quality
Gemini 3 Flash Preview
Marginally better benchmark scores; both are excellent
Best for Cost
GPT-5.1-Codex-Mini
36% lower pricing; better value at scale
Best for Reliability
Gemini 3 Flash Preview
Higher uptime and faster response speeds
Best for Prototyping
Gemini 3 Flash Preview
Stronger community support and better developer experience
Best for Production
Gemini 3 Flash Preview
Wider enterprise adoption and proven at scale
by Google
- Choose for Quality - Marginally better benchmark scores; both are excellent
- 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 | Gemini 3 Flash Preview | GPT-5.1-Codex-Mini |
|---|---|---|
| Vision (Image Input) | ||
| Function Calling | ||
| Streaming | ||
| JSON Mode | ||
| Reasoning | ||
| Web Search | ||
| Image Output |
Gemini 3 Flash Preview
GPT-5.1-Codex-Mini
OpenAI
GPT-5.1-Codex-Mini saves you $1.65/month
That's 37% cheaper than Gemini 3 Flash Preview 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 | Gemini 3 Flash Preview | GPT-5.1-Codex-Mini |
|---|---|---|
| Context Window | 1.0M | 400K |
| Max Output Tokens | 65,535 | 100,000 |
| Open Source | No | No |
| Created | Dec 17, 2025 | Nov 13, 2025 |