Cheapest AI models that are still useful
The cheapest answer is the one that reaches an acceptable result with the least total cost. Credits matter, but so do retries, corrections and human review time.
THE SHORT ANSWER
Choose by task, not by logo.
Qwen, GPT-OSS and Gemini Flash currently use 0 CR; DeepSeek and Mistral use the live credit amounts shown in the picker. Test efficient models first, then escalate only when a stronger model improves the result.
DeepSeek V4 Flash
Cost-efficient reasoning and coding.
- Provider
- DeepSeek
- Prima Ordia cost
- 1 credit
- Images
- Text only
Qwen 3.6 Beta
Multilingual reasoning and coding from Alibaba's Qwen family.
- Provider
- OpenRouter · Alibaba Qwen
- Prima Ordia cost
- 0 credits
- Images
- Text only
GPT-OSS 120B
OpenAI's open-weight reasoning model, routed by OpenRouter.
- Provider
- OpenRouter · OpenAI
- Prima Ordia cost
- 0 credits
- Images
- Text only
01 / WHERE IT FITS
Good reasons to test these models
- High-volume routine work
- Model routing experiments
- Coding first passes
- Drafting and summarising at scale
02 / KEEP YOUR GUARD UP
What a useful comparison must catch
- Count retries and editing time
- Credits may change
- Low-cost models still need review
- Use stronger models for genuinely difficult or high-risk tasks
03 / THE SCORECARD
Judge the finished work, not the demo.
Give every model the same context and constraints. Score each dimension from one to five, then include the time you spent correcting the answer.
Answer quality
Does the answer solve the task accurately, completely and at the right level of detail?
Reasoning
Can it handle constraints, expose assumptions and recover when the first approach fails?
Speed
Is it responsive enough for the way you actually work, including revisions?
Value
Does the result justify its credit cost for this particular task?
DON'T CHOOSE BASED ON OUR OPINION
Test them yourself.
04 / A FAIR TEST
Five rules that make the result worth trusting
- Use real work.Choose a task you repeat, not a trick question designed for a leaderboard.
- Hold the prompt constant.Same context, constraints, requested format and deadline for every model.
- Define success first.Write down what a correct, useful answer must contain before you see any output.
- Run more than one example.Include an easy, typical and difficult case so one lucky result cannot decide.
- Count correction time.The cheapest or fastest response loses if it creates more work before acceptance.
05 / COMMON QUESTIONS
What people ask
What is the cheapest model in Prima Ordia?+
Gemini Flash, Qwen and GPT-OSS currently use 0 CR. Free accounts also receive a 0 CR ChatGPT tier. Fair-use safeguards still apply.
Are cheap AI models good enough?+
Often, for clear routine tasks. Test acceptance rate and correction time rather than assuming price predicts quality.
When should I use a premium model?+
Escalate when complexity, ambiguity, risk or repeated failure makes better reasoning worth the additional credits.