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Head to head · prices checked 22 September 2026

Claude Opus 5 vs GPT-5.6 Sol

The two premium workhorses teams pick for agents and long documents, with close list prices. Both list prices from the makers’ own pages, and what three everyday jobs cost on each.

What a job costsEvery model

US dollars, standard rate, shortest context band. Price only: this page does not rank quality.

1,000 support replies
+25%what Claude Opus 5 costs next to GPT-5.6 Sol
Claude Opus 5
$25.00
GPT-5.6 Sol
$20.00
Claude Opus 5, per M tokens
$5 / $25
GPT-5.6 Sol, per M tokens
$4 / $20

3,000 tokens in and 400 out each, at list price.

Per million tokens, Claude Opus 5 costs $5 in and $25 out; GPT-5.6 Sol costs $4 in and $20 out. 1,000 support replies cost $25.00 on Claude Opus 5 and $20.00 on GPT-5.6 Sol, so Claude Opus 5 costs 25% more. Claude Opus 5 reads up to 1M tokens at once, GPT-5.6 Sol up to 1.05M.

Side by side

Each maker’s published rate for its standard tier. Cached input is what a repeated prompt prefix costs once the provider has stored it.

Claude Opus 5 and GPT-5.6 Sol: list prices and specifications
FactClaude Opus 5GPT-5.6 Sol
MakerAnthropicOpenAI
TierFlagshipsFlagships
Input, per M tokens$5.00$4.00
Output, per M tokens$25.00$20.00
Cached input$0.50$0.40
Context window1M1.05M
Released24 Jul 20269 Jul 2026
WeightsClosedClosed

What a job costs on each

1,000 runs of each job at the two list prices. The gap moves from job to job because the models price input, output and cached context differently.

Cost of 1,000 runs of three jobs on Claude Opus 5 and GPT-5.6 Sol
JobClaude Opus 5GPT-5.6 SolCheaper
Support reply3,000 in, 400 out.$25.00$20.00GPT-5.6 Sol, 20% less
Document summary25,000 in, 1,000 out.$150$120GPT-5.6 Sol, 20% less
Agent task80,000 in (70,000 cached), 3,000 out.$160$128GPT-5.6 Sol, 20% less

The token counts are ours, chosen to look like real work; the prices are the makers’. A model with no published cache price bills the agent task’s repeated context at its full input rate.

The small print

What each base rate leaves out, from the makers’ own pages: surcharges, discounts, promotions and cache pricing.

Claude Opus 5
Cache write $6.25 (5 min) or $10 (1 h). Fast mode $10 / $50. Batch API 50% off. US-only inference (inference_geo) bills 1.1x. Full context window billed at standard rates. Anthropic’s pricing page
GPT-5.6 Sol
Promotional price since 2026-08-21, 'at least through November 21, 2026'; the previous price was $5 / $30. Requests above 272K input tokens bill 2x input and 1.5x output ($8 / $30). Cache write $5. Batch and Flex 50% off. Data residency adds 10%. OpenAI’s pricing page

Other comparisons

Every head to head on the list that involves Claude Opus 5 or GPT-5.6 Sol.

Run both for a quarter of list price

AIGROW API credit covers Claude Opus 5 and GPT-5.6 Sol and is metered at the list prices above: $25 buys $100 of usage.

See API creditCompare every model

Prices checked 22 September 2026