Start with what you want to get done. We'll match your task to the evidence, not to the biggest marketing budget.
Here are the options worth considering.
We've ranked these using the tests that are relevant to your task. Each test has limits, so treat this as a useful starting point, not a guarantee.
In short
For homework and maths, our pick is GPT-6.1 Sol. GPT-6 Astra and Claude Opus 5.5 are too close to call against it. If you would rather use a model with open weights, Kimi K3 is the best of those we can see. We have verified prices for GPT-6.1 Sol and GPT-6 Astra only; for the rest we cannot say what they cost.
For Homework and maths, we looked at hard maths problems first.
Best-supported choice
Scored highest on hard maths problems among the models with enough evidence, and none of its other relevant results put it behind the leaders.
Worth knowing: In the middle of the listed models for writing: 1,425 on Arena text: creative writing, 54th of 77.
Price: - ChatGPT Plus: GBP 20.00 per month (price source, verified 29 Oct 2026)
- ChatGPT Pro (from): GBP 89.00 per month (price source, verified 29 Oct 2026)
How we know: scores and sources
See everything about GPT-6.1 Sol
Also worth a look
Good-enough alternative Close call with our top pick
Rated Top tier on hard maths problems.
Worth knowing: On maths votes it sits in the middle of the listed models.
Price: - ChatGPT Plus: GBP 20.00 per month (price source, verified 29 Oct 2026)
- ChatGPT Pro (from): GBP 89.00 per month (price source, verified 29 Oct 2026)
How we know: scores and sources
Full profile for GPT-6 Astra
Good-enough alternative Close call with our top pick
Rated Top tier on hard maths problems.
Worth knowing: Its score is within the margin of error of the best-supported choice, so the order between them is not settled.
Price: Price not independently verified
How we know: scores and sources
Full profile for Claude Opus 5.5
Best open-weights option
Rated Strong on hard maths problems. Its weights are published under an open licence, so it can be offered by more than one provider. We have not verified any price or free access.
Worth knowing: Not enough data for fixing real software bugs, so part of the picture is missing.
Price: Price not independently verified
How we know: scores and sources
Full profile for Kimi K3
About cost. We can compare performance, but we don't yet have enough verified pricing data to tell you which option is cheapest. We never use API prices as a stand-in for consumer subscription prices, and we never assume a free tier has the same features, limits or model access as a paid plan. New to tokens and “per million”? Read how AI pricing works.
Other models with enough evidence (39)
These have a result for the main test but were not shown above. They rated Middle or Behind the leaders on it, or fell outside the top few. Listed in score order.
Models we could not rank for this task (34)
Missing evidence is not a low score. These models are left out of the ranking because the tests for this task have no result for them.
How this was decided: our recommendation rules. Results are relative to the 77 models listed here.
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