Gemini 2.5 Flash vs GPT-5.6 Sol
Pricing, benchmarks, and use case comparison
Quick take
- •Gemini 2.5 Flash is meaningfully stronger at cost efficiency (92 vs 55 on our capability index).
- •GPT-5.6 Sol is meaningfully stronger at coding (97 vs 75).
- •Gemini 2.5 Flash is 94% cheaper on input tokens, which compounds fast on high-volume or agentic workloads.
Specs comparison
| Gemini 2.5 Flash | GPT-5.6 Sol | |
|---|---|---|
| Provider | Google DeepMind | OpenAI |
| Type | Closed source | Closed source |
| Context window | ✓1,048,576 tokens (1M) input; up to 65,535 output | Not announced |
| Input / 1M tokens | ✓$0.30 | $5.00 |
| Output / 1M tokens | $2.50 | $30.00 |
| Release date | 2025-06 | 2026-06 |
Benchmarks
| Benchmark | Gemini 2.5 Flash | GPT-5.6 Sol |
|---|---|---|
| Context window | 1M tokens | - |
| Input price | $0.30/1M | - |
| Terminal-Bench 2.1 | - | 88.8% |
| Terminal-Bench 2.1 (Ultra) | - | 91.9% |
| ExploitBench | - | competitive with Mythos Preview |
Scores sourced from official provider release posts and independent benchmark aggregators.
Which should you choose?
Choose Gemini 2.5 Flash if...
- →High-volume, latency-sensitive production workloads
- →Chatbots, extraction, classification, and summarization at scale
- →You need decent reasoning but must control costs
Choose GPT-5.6 Sol if...
- →You are an approved preview partner needing the most capable model for agentic software engineering
- →Complex multi-step tasks that benefit from subagent orchestration (Ultra) or maximum reasoning depth (max)
- →Frontier scientific research, professional knowledge work, or security-sensitive workloads