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API price comparison · Updated

Claude Opus 5.5 vs GPT-6.1 Sol pricing

Quick answer

Claude Opus 5.5 costs $4.00 per million input tokens and $20.00 per million output tokens; GPT-6.1 Sol costs $2.00 and $10.00. For an agent task (80,000 input tokens, 60,000 of them cached, and 6,000 output), Claude Opus 5.5 costs $0.212 and GPT-6.1 Sol $0.106: Claude Opus 5.5 costs 2× as much.

Compare your monthly cost on Claude Opus 5.5 and GPT-6.1 Sol

Estimated monthly cost
Claude Opus 5.5$2,200$0.022 per request
GPT-6.1 Sol$1,100$0.011 per request

GPT-6.1 Sol costs 50% less for this workload. Excludes cache writes, tools and taxes.

Claude Opus 5.5 vs GPT-6.1 Sol prices per million tokens

PriceClaude Opus 5.5GPT-6.1 Sol
Model IDclaude-opus-5-5gpt-6.1-sol
Input$4.00$2.00
Cache read$0.20$0.10
Cache write$5.00$2.50
Output$20.00$10.00
Batch in / out$2.00 / $10.00$1.00 / $5.00
Long promptsSame rateOver 272,000: $4.00 / $15.00
Scheduled changeNone announcedNone announced
StatusAvailableAvailable

Prices for each provider’s own API, from Anthropic’s pricing page and OpenAI’s pricing page. The lower price in each row is highlighted. Ganivra uses these same rates to price Claude Opus 5.5 and GPT-6.1 Sol calls.

What one request costs on Claude Opus 5.5 and GPT-6.1 Sol

Worked out from the prices above at standard rates, with no Batch discount. Long-prompt rates apply where a model has them.

RequestClaude Opus 5.5GPT-6.1 SolPer 1,000 requestsDifference
Chat reply3,000 input tokens, 500 output$0.022$0.011$22.00 / $11.00Claude Opus 5.5 costs 2× as much
Document summary30,000 input tokens, 1,500 output$0.150$0.075$150 / $75.00Claude Opus 5.5 costs 2× as much
Agent task80,000 input tokens (60,000 cached), 6,000 output$0.212$0.106$212 / $106Claude Opus 5.5 costs 2× as much
Long document300,000 input tokens, 2,000 output$1.24$1.23$1,240 / $1,230GPT-6.1 Sol costs 1% less

What changes which one costs less

Prompt caching
Cache reads cost $0.20 per million, 5% of the input price on Claude Opus 5.5, and $0.10 per million, 5% of the input price on GPT-6.1 Sol. The more of each prompt you reuse, the more this decides the bill.
Cache writes
Claude Opus 5.5 charges $5.00 per million tokens written to cache. GPT-6.1 Sol charges $2.50 per million tokens written to cache.
Long prompts
On Claude Opus 5.5, one rate at any prompt length. On GPT-6.1 Sol, prompts over 272,000 tokens cost $4.00 input and $15.00 output for the whole request. A 300 prompt costs $1.24 on Claude Opus 5.5 and $1.23 on GPT-6.1 Sol.
Batch API
Claude Opus 5.5 costs 50% less through the Batch API: $2.00 input and $10.00 output. GPT-6.1 Sol costs 50% less through the Batch API: $1.00 input and $5.00 output.
Token counts
Anthropic and OpenAI use different tokenizers, so the same text becomes a different number of tokens. The model with the lower per-token price can still cost more per request; compare on your own prompts before switching.

Compare them on your own customers, not a sample request.

Ganivra prices every Claude Opus 5.5 and GPT-6.1 Sol call you make and adds it up by customer, feature and workflow, next to what each customer pays. Switch a workflow and see what it did to each customer’s margin.

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Claude Opus 5.5 vs GPT-6.1 Sol pricing questions

Is Claude Opus 5.5 cheaper than GPT-6.1 Sol?

Per million tokens, Claude Opus 5.5 costs $4.00 input and $20.00 output, and GPT-6.1 Sol $2.00 input and $10.00 output. For an agent task (80,000 input tokens, 60,000 of them cached, and 6,000 output), Claude Opus 5.5 costs 2× as much: $212 against $106 per 1,000 tasks.

How much does Claude Opus 5.5 cost per million tokens?

$4.00 input and $20.00 output per million tokens on Anthropic's API, with cached input at $0.20 and Batch at $2.00 input and $10.00 output. The rate is the same at any prompt length.

How much does GPT-6.1 Sol cost per million tokens?

$2.00 input and $10.00 output per million tokens on OpenAI's API, with cached input at $0.10 and Batch at $1.00 input and $5.00 output. Prompts over 272,000 tokens cost $4.00 input and $15.00 output.

Which is cheaper for long prompts, Claude Opus 5.5 or GPT-6.1 Sol?

For a 300,000 input tokens, 2,000 output request, Claude Opus 5.5 costs $1.24 and GPT-6.1 Sol $1.23: GPT-6.1 Sol costs 1% less. On Claude Opus 5.5, one rate at any prompt length; on GPT-6.1 Sol, prompts over 272,000 tokens cost $4.00 input and $15.00 output for the whole request.

How do I compare Claude Opus 5.5 and GPT-6.1 Sol on my own traffic?

Record what each call actually used, then price the same usage on both models. Ganivra does this from your recorded calls: it shows what each customer, feature and workflow would cost on Claude Opus 5.5 and on GPT-6.1 Sol, next to what each customer pays you.

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