AI Model (LLM API) · decision tool

Google Gemini 2.5 Pro alternatives — ranked for your stack

Leaving Google Gemini 2.5 Pro? The other AI model options ranked at your usage, budget and constraints with verified dated pricing — plus when Google Gemini 2.5 Pro is still the right call.

Prices verified 2026-07-13 against official pricing pages · fit weights are our estimates (see methodology) · share the URL to share your configuration

As of Jul 2026, with 50M input tokens/month, 10 millions output tokens / month, a $50 budget for this slot, DeepSeek V4 Pro ranks first for these inputs at 90% fit and a StackSays-estimated $30.45/month (OpenAI GPT-5 Mini: 86% fit, $32.50/month). Fit weights are our estimates; prices trace to official pages. Change any input below and the verdict recomputes.

Your situation

The verdict updates as you move these.

Input tokens / month (millions)prompts + context + RAG chunks; a modest AI feature runs 10–100MOutput tokens / month (millions)completions; usually 5–20% of input volumeBudget for this slot ($/mo)what you'd accept paying for the AI model layerTeam size1 = solo; bundled platforms save glue time for small teams

Narrow pick — the runner-up is close

DeepSeek V4 Profit 90% · est $30.45/mo

Open-weights workhorse at a fraction of closed-model prices

vs OpenAI GPT-5 Mini: fit 90% against 86%, est $30.45 against $32.50 per month

DeepSeek V4 Profit 90%

$30.45/mo

OpenAI GPT-5 Minifit 86%

$32.50/mo

DeepSeek V4 Flashfit 84%

$5.39/mo

OpenAI GPT-5 Nanofit 81%

$6.50/mo

Google Gemini 2.5 Flashfit 73%

$40.00/mo

OpenAI GPT-5fit 43%

$162.50/mo

Anthropic Claude Opus 4.8fit 43%

$500.00/mo

Anthropic Claude Sonnet 5fit 36%

$200.00/mo

Anthropic Claude Haiku 4.5fit 27%

$100.00/mo

Comparing 9 tools head-to-head. Open the full field (10 options) →

The decision, in plain words

For a solo builder at 50M input tokens/month and a $50.00/mo budget for the AI model slot, DeepSeek V4 Pro leads at 90% fit and $30.45/mo. The two rules doing the work: budget fit (~$30.45/mo is 61% of your $50/mo budget); ecosystem maturity (established — our estimate from ecosystem age, docs and hiring pool).

OpenAI GPT-5 Mini runs close (86% fit, $32.50/mo). It takes the lead if ~$32.5/mo is 65% of your $50/mo budget matters more to you than the current weights assume.

Generated from the calculation above — every number traces to the sourced data; nothing here is written by an AI making things up.

Why DeepSeek V4 Pro scores 90%

Budget fit (weight 30, our estimate) — ~$30.45/mo is 61% of your $50/mo budget+26.73

Exit cost (weight 4, our estimate) — Open weights — self-host or switch inference providers freely+4

Ecosystem maturity (weight 8, our estimate) — established — our estimate from ecosystem age, docs and hiring pool+8

Capability tier (weight 14, our estimate) — workhorse — our estimate from vendor positioning, not a benchmark; budget models degrade first on long agentic chains+6.3

Total (lines sum exactly)45.03

Possible range −56…+56 (sum of active rule weights) · fit % = (total + max) / (2 × max)(45.03 + 56) / 112 = 90%

How the $30.45/mo estimate is calculated

input tokens overage — 50M over 0M included × $0.435/M$21.75

output tokens overage — 10M over 0M included × $0.87/M$8.70

Note — Prompt caching available (cached reads $0.0036/M) — not modeled here$0

Monthly total (lines sum exactly)$30.45

What could change this verdict

Cost risk

Estimated now (StackSays estimate, not your final bill)$30.45/mo · API pay-as-you-go

Free-tier statusNo free tier — paid from the first unit

Biggest unpriced/uncertain variablePrompt caching available (cached reads $0.0036/M) — not modeled here

Official prices verified 2026-07-13; calculation is deterministic code over those prices.

At a glance

Tool	Free tier	Paid entry	Verified
Anthropic Claude Opus 4.8	No free tier	Pay-as-you-go — Prompt caching available (cached reads $0.5/M) — not modeled here	2026-07-13
Anthropic Claude Sonnet 5	No free tier	Pay-as-you-go — Prompt caching available (cached reads $0.2/M) — not modeled here	2026-07-13
Anthropic Claude Haiku 4.5	No free tier	Pay-as-you-go — Prompt caching available (cached reads $0.1/M) — not modeled here	2026-07-13
OpenAI GPT-5	No free tier	Pay-as-you-go — Prompt caching available (cached reads $0.125/M) — not modeled here	2026-07-13
OpenAI GPT-5 Mini	No free tier	Pay-as-you-go — Prompt caching available (cached reads $0.025/M) — not modeled here	2026-07-13
OpenAI GPT-5 Nano	No free tier	Pay-as-you-go — Prompt caching available (cached reads $0.01/M) — not modeled here	2026-07-13
Google Gemini 2.5 Flash	No free tier	Pay-as-you-go — Prompt caching available (cached reads $0.03/M) — not modeled here	2026-07-13
DeepSeek V4 Pro	No free tier	Pay-as-you-go — Prompt caching available (cached reads $0.0036/M) — not modeled here	2026-07-13
DeepSeek V4 Flash	No free tier	Pay-as-you-go — Prompt caching available (cached reads $0.0154/M) — not modeled here	2026-07-13

Where did you land?anonymous, one click

Data sources

Tool	Source	Verified
Anthropic Claude Opus 4.8	OpenRouter live pricing (CalcSays daily sync, fetched 2026-07-13)	2026-07-13
Anthropic Claude Sonnet 5	OpenRouter live pricing (CalcSays daily sync, fetched 2026-07-13)	2026-07-13
Anthropic Claude Haiku 4.5	OpenRouter live pricing (CalcSays daily sync, fetched 2026-07-13)	2026-07-13
OpenAI GPT-5	OpenRouter live pricing (CalcSays daily sync, fetched 2026-07-13)	2026-07-13
OpenAI GPT-5 Mini	OpenRouter live pricing (CalcSays daily sync, fetched 2026-07-13)	2026-07-13
OpenAI GPT-5 Nano	OpenRouter live pricing (CalcSays daily sync, fetched 2026-07-13)	2026-07-13
Google Gemini 2.5 Flash	OpenRouter live pricing (CalcSays daily sync, fetched 2026-07-13)	2026-07-13
DeepSeek V4 Pro	OpenRouter live pricing (CalcSays daily sync, fetched 2026-07-13)	2026-07-13
DeepSeek V4 Flash	OpenRouter live pricing (CalcSays daily sync, fetched 2026-07-13)	2026-07-13

A monitor re-checks these pages for changes; when a vendor moves a price, the date updates and every verdict recomputes.

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