Is o3 a good deal?

As of Sep 23, 2026, o3 is dominated for Balanced on LMArena. Muse Spark 1.3 scores 79.8 higher and costs 43% less, with a covering envelope. 13 of 136 rated, priced standard models are undominated.

Inspect model evidence Compare differences & requirements

Muse Spark 1.3 is both better and cheaper than o3: 79.8 points higher on LMArena and 43% less per million tokens, $1.50 cheaper at this mix.

o3 takes image, text, file, returns up to 100,000 tokens from a 200,000-token context, and is listed by 1 seller.

Compared against 136 rated, priced models on this lens: 8 models dominate it and give up nothing, 5 more dominate it but give something up. o3 scores 1409.9 at $3.50 per million tokens for this mix.

Envelope-safe replacements

Each row scores at least as high, costs no more, and covers this model’s context, output, modalities, tools, and reasoning. A cheaper narrower model is not listed here.

Model	LMArena	Effective $/M	You save
Muse Spark 1.3	1489.7 +79.8	$2.00/M	43%
Muse Spark 1.1	1480.2 +70.3	$2.00/M	43%
Grok 4.5	1450.1 +40.2	$3.00/M	14%
GPT-5.6 Luna	1429.9 +20.0	$0.450/M	87%
Grok 4.6	1429.9 +20.0	$3.00/M	14%
GPT-5.1	1422.6 +12.7	$3.44/M	2%
Mistral Medium 3.5	1420.6 +10.7	$3.00/M	14%
GPT-5.4 Mini	1412.1 +2.2	$1.69/M	52%

Higher score, lower price, named losses

Not a drop-in. The loss is why these are not a recommendation.

Model	LMArena	Effective $/M	You give up
Gemini 3.8 Flash	1494.7	$1.50/M	max output
Gemini 3.7 Flash	1490.5	$1.50/M	max output
Gemini 3.6 Flash	1476.1	$1.50/M	max output
Gemini 3.5 Flash	1475.7	$3.38/M	max output
GLM 5.3	1475.1	$1.29/M	image, file

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