Claude Opus 4.8 vs GPT-5.5
Claude Opus 4.8 costs less on output ($7.50 against $9.00 per million tokens); input costs the same on both ($1.50). Both on one key at UplinkSwitch, each next to its developer's list price.
Prices · per million tokens, USD
| Tokens | Claude Opus 4.8claude-opus-4-8 | GPT-5.5gpt-5.5 |
|---|---|---|
| Input | $1.50Anthropic lists $5.00 · 70% under | $1.50OpenAI lists $5.00 · 70% under |
| Cached input | $0.15Anthropic lists $0.50 · 70% under | $0.15OpenAI lists $0.50 · 70% under |
| Output | $7.50Anthropic lists $25.00 · 70% under | $9.00OpenAI lists $30.00 · 70% under |
| Context window | 1,000,000 tokens | 1,050,000 tokens |
| Max output | 128,000 tokens | 128,000 tokens |
| Input | text, image | text, image |
| Released | 2026-05-28 | 2026-04-24 |
| Anthropic lifecycle | active, retires no sooner than 2027-05-28 | — |
| Formats | Anthropic SDK, OpenAI SDK | OpenAI SDK |
| Developer | Anthropic | OpenAI |
List price: each developer's published rate, read October 2026. A model with no cached rate bills cached tokens at its input rate. Live from GET https://api.uplinkswitch.com/v1/catalog. Lifecycle from Anthropic's model deprecations, read 2026-10-19.
What the same work costs · USD, here and at list
| Work | Claude Opus 4.8 | GPT-5.5 |
|---|---|---|
| 1,000 chat requests | $6.75list $22.50 | $7.50list $25.00 |
| 100 long documents | $9.00list $30.00 | $9.30list $31.00 |
| A month of both, daily | $472.50list $1,575.00 | $504.00list $1,680.00 |
A chat request is 2,000 input and 500 output tokens; a long document is 50,000 in and 2,000 out; the month is 1,000 chats and 100 documents a day for 30 days, uncached. Over that month Claude Opus 4.8 costs $31.50 less here.
Newest in the line
- Claude Opus 5.5 is the newest in Claude Opus 4.8's line: $2.10 in and $6.00 out per million tokens here, against $4.00 and $20.00 at list. Claude Opus 5.5 vs Claude Opus 4.8.
Same key, same URL
One base URL and one key serve both models. The request below calls Claude Opus 4.8; put gpt-5.5 in the model field to call GPT-5.5 instead.
shell
curl https://api.uplinkswitch.com/v1/chat/completions \
-H "authorization: Bearer sk-uplink-live-..." \
-H "content-type: application/json" \
-d '{"model":"claude-opus-4-8","messages":[{"role":"user","content":"Hello"}]}'Model pages: Claude Opus 4.8, GPT-5.5. Pricing by family: Claude, GPT. More comparisons: Claude Opus 5.5 vs Claude Opus 4.8, Claude Sonnet 5 vs Claude Opus 4.8, Claude Fable 5 vs Claude Opus 4.8, Claude Opus 5 vs Claude Opus 4.8.
Questions
- Which costs less, Claude Opus 4.8 or GPT-5.5?
- Claude Opus 4.8 costs less on output ($7.50 against $9.00 per million tokens); input costs the same on both ($1.50).
- Can I switch between them by changing the model id?
- Yes. Both answer in the OpenAI SDK format at the same base URL with the same key. Change the model id from claude-opus-4-8 to gpt-5.5 and nothing else.
- Is there a subscription?
- No. Prepaid credit from $10, with no subscription or monthly fee. Each top-up locks your prices for 30 days.
- Is Claude Opus 4.8 better than GPT-5.5?
- Better depends on the job; this page compares what the catalog can measure. Claude Opus 4.8 costs less on output ($7.50 against $9.00 per million tokens); input costs the same on both ($1.50). Claude Opus 4.8 takes 1,000,000 tokens of context against 1,050,000 for GPT-5.5. Claude Opus 4.8 is the newer release. Both run on the same key, so the fair test is your own prompt sent to each model id.