Cost per coding-agent request

Is Gemini 3.1 Flash Lite or GPT-5.6 Sol cheaper for coding agents?

For coding agents, GPT-5.6 Sol costs 20x as much as Gemini 3.1 Flash Lite per request ($0.17 vs $0.0082 on our measured traffic), because GPT-5.6 Sol lists at $4 input, $0.40 cached input and $20 output per million tokens against $0.25, $0.025 and $1.50 for Gemini 3.1 Flash Lite, and GPT-5.6 Sol charges more for prompts over 272K tokens.

List prices: OpenRouter listed price, OpenAI API pricing, checked 2026-10-13. Request costs: Standard Compute gateway data, 79,301 coding-agent requests from 75 users, Sep 13 to Oct 12, 2026. How we compute this

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Cost per coding-agent request, side by side

Cost at list price	Flash Lite	GPT-5.6 Sol
Prompt under 100K tokens50% of requests, 87% of input cached	$0.0040	$0.062
Prompt of 100K to 272K39% of requests, 88% of input cached	$0.0099	$0.16
Prompt over 272K tokens11% of requests, 86% of input cached	$0.022	$0.68
Average request	$0.0082	$0.17
100 requests	$0.82	$16.50
Median session16 requests; a session ends after 10 idle minutes	$0.11	$1.80
A month of regular usemedian of 20 users active on 5+ days	$12.53	$233

Each logged request priced at the listed rates above for its own token counts, including cache reads and any higher rate for long prompts. Average output: 698 tokens per request.

Benchmarks, speed and latency, side by side

Artificial Analysis	Flash Lite	GPT-5.6 Sol
Intelligence Index10 evaluations, 0 to 100	16	47
Terminal-Bench 4.0agentic coding in a terminal	0.5%	39.9%
Output speedmedian	365 tokens/s	94 tokens/s
Time to first answer tokenincludes thinking time	5.0 s	2.1 min

Source: Artificial Analysis (artificialanalysis.ai). Measured variants: Gemini 3.1 Flash-Lite, speed on Google; GPT-5.6 Sol (Max), speed on OpenAI. Fetched October 13, 2026. Artificial Analysis runs Terminal-Bench 4.0 in its own setup, so its scores differ from the tbench.ai leaderboard.

What to watch for

The gap widens on long prompts: under 100K tokens GPT-5.6 Sol costs 15x as much per request, over 272K 32x. GPT-5.6 Sol is superseded: GPT-6.1 Sol costs $0.067 per request. The price is OpenRouter's listed rate on October 13, 2026, which can be a third-party host's; Google's own API may charge differently.

FAQ

Is Gemini 3.1 Flash Lite cheaper than GPT-5.6 Sol for coding agents?

Yes, at the listed prices. 100 average coding-agent requests cost $0.82 on Gemini 3.1 Flash Lite and $16.50 on GPT-5.6 Sol. A median 16-request session costs $0.11 vs $1.80. Measured on 79,301 real coding-agent requests (Sep 13 to Oct 12, 2026).

How much does a month of GPT-5.6 Sol vs Flash Lite cost?

For the median regular user in our data (1,478 requests in 30 days), about $233 on GPT-5.6 Sol and $12.53 on Gemini 3.1 Flash Lite at list price. Heavier users pay proportionally more.

Gemini 3.1 Flash Lite vs GPT-5.6 Sol: which is better for agents?

GPT-5.6 Sol scores higher on output quality (8.6/10 vs 4.3/10), while Gemini 3.1 Flash Lite is the cheaper option. Gemini 3.1 Flash Lite is best for simple, high-volume steps such as classification and extraction; GPT-5.6 Sol is best for existing GPT-5.6 Sol setups until they move to GPT-6.1 Sol. Live community votes on this page show what people actually prefer.

Can I switch between Gemini 3.1 Flash Lite and GPT-5.6 Sol in the same agent?

Yes. Model-agnostic agents (Cline, Aider, OpenClaw, Hermes Agent, Kilo Code, OpenCode) let you swap models per task. Many people route hard tasks to the stronger model and routine work to the cheaper one.

Community vote

Pick a winner in each dimension. You can change your vote any time.

Output Quality

Correctness and depth of what it produces

Agentic Ability

Tool calls, instruction-following, and multi-step tasks

Speed

Tokens per second and time-to-first-token

Value for Money

How much capability you get per dollar

Reliability

Consistent results: fewer refusals, loops and format breaks

Current Claude, GPT, Gemini and open models are included with Standard Compute

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Current frontier models Claude Fable 5.1 · GPT-6 Astra

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