GPT-5.6 API
Choose the right GPT-5.6 tier
All three variants use the same OpenAI-compatible integration. Switch capability and cost with one exact model ID.
GPT-5.6 pricing
Live EvoLink group prices, expressed in USD first and Credits second, with OpenAI official prices and savings shown alongside every rate.
Token cost estimator
Cached and cache-write tokens are excluded from ordinary input to prevent double counting.Estimated request cost
GPT-5.6 SolLong-context rates apply to the entire request when total prompt tokens exceed 272,000.
EvoLink vs OpenAI direct
Same token mix, selected tier, and context band.Request budget guide
Estimate how far your credits go with the current token mix.Good for a first validation.
Good for sustained testing.
Good before production integration.
Model pricing
| Model | Context band | Uncached input | Cache read | Cache write | Output |
|---|---|---|---|---|---|
GPT-5.6 Solgpt-5.6-sol | ≤ 272K prompt tokens | $4.500 / 1M-10% 306 cr / 1M$5.000OpenAI official | $0.450 / 1M-10% 30.6 cr / 1M$0.500OpenAI official | $5.625 / 1M-10% 382.5 cr / 1M$6.250OpenAI official | $27.000 / 1M-10% 1836 cr / 1M$30.000OpenAI official |
GPT-5.6 Solgpt-5.6-sol | > 272K prompt tokens | $9.000 / 1M-10% 612 cr / 1M$10.000OpenAI official | $0.900 / 1M-10% 61.2 cr / 1M$1.000OpenAI official | $11.250 / 1M-10% 765 cr / 1M$12.500OpenAI official | $40.500 / 1M-10% 2754 cr / 1M$45.000OpenAI official |
GPT-5.6 Terragpt-5.6-terra | ≤ 272K prompt tokens | $2.250 / 1M-10% 153 cr / 1M$2.500OpenAI official | $0.225 / 1M-10% 15.3 cr / 1M$0.250OpenAI official | $2.814 / 1M-10% 191.3 cr / 1M$3.125OpenAI official | $13.500 / 1M-10% 918 cr / 1M$15.000OpenAI official |
GPT-5.6 Terragpt-5.6-terra | > 272K prompt tokens | $4.500 / 1M-10% 306 cr / 1M$5.000OpenAI official | $0.450 / 1M-10% 30.6 cr / 1M$0.500OpenAI official | $5.627 / 1M-10% 382.6 cr / 1M$6.250OpenAI official | $20.250 / 1M-10% 1377 cr / 1M$22.500OpenAI official |
GPT-5.6 Lunagpt-5.6-luna | ≤ 272K prompt tokens | $0.900 / 1M-10% 61.2 cr / 1M$1.000OpenAI official | $0.092 / 1M-9% 6.2 cr / 1M$0.100OpenAI official | $1.125 / 1M-10% 76.5 cr / 1M$1.250OpenAI official | $5.400 / 1M-10% 367.2 cr / 1M$6.000OpenAI official |
GPT-5.6 Lunagpt-5.6-luna | > 272K prompt tokens | $1.800 / 1M-10% 122.4 cr / 1M$2.000OpenAI official | $0.183 / 1M-9% 12.4 cr / 1M$0.200OpenAI official | $2.250 / 1M-10% 153 cr / 1M$2.500OpenAI official | $8.100 / 1M-10% 550.8 cr / 1M$9.000OpenAI official |
GPT-5.6 Sol
GPT-5.6 Terra
GPT-5.6 Luna
EvoLink rates use your current group. The struck-through OpenAI official rate uses the same model, token role, and context multiplier for an exact comparison.
GPT-5.6 API — Sol, Terra & Luna
Use all three GPT-5.6 tiers through one EvoLink API key: Sol for maximum capability, Terra for balanced production workloads, and Luna for fast, cost-efficient scale.
Four-part prompt caching
Uncached input, cache reads, cache writes, and output are settled separately from the final usage object. Cache writes are not charged again as ordinary input.
Long-context threshold
At more than 272K prompt tokens, input and both cache roles use 2x rates while output uses 1.5x rates for the entire request.
GPT-5.6 vs other text models
EvoLinkCompare the selected GPT-5.6 tier with comparable frontier text models using EvoLink prices per 1M tokens.
| Feature | GPT-5.6 Sol | Claude Opus 4.8 | Gemini 3.1 Pro |
|---|---|---|---|
| EvoLink price / 1M (input / output) | $4.5 / $27 | $4.5 / $22.5 | $1.68 / $10.08 |
| Context window | 1.05M | 1M | 1M |
| Prompt caching | Cache read + cache write | Cache read + cache write | Context caching |
| Best for | Hard reasoning, coding agents, and high-value workflows | Anthropic flagship for deep reasoning, coding, and long-running agents. | Google flagship for multimodal reasoning and large-context workloads. |
Base-context prices use the current EvoLink user group. Logged-in users see their group rates; signed-out users see Default rates. Long-context multipliers remain in each model's Pricing section.
Other GPT models on EvoLink
Other text models
GPT-5.6 API - FAQ
Which model IDs are available?
Use gpt-5.6-sol, gpt-5.6-terra, gpt-5.6-luna. A generic gpt-5.6 alias is not available.
How is cached input billed?
Cache reads and cache writes are separate token segments. Neither segment is billed again as ordinary input.
When do long-context rates apply?
When total prompt tokens exceed 272,000, the whole request uses the long-context multipliers shown in the pricing table.
Use GPT-5.6 through the EvoLink API
Chat Completions and Responses are both supported. Change only the exact model ID to switch tiers.
POST /v1/chat/completionscurl https://api.evolink.ai/v1/chat/completions \
-H "Authorization: Bearer $EVOLINK_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "gpt-5.6-sol",
"messages": [{"role": "user", "content": "Plan a production rollout."}],
"reasoning_effort": "high",
"prompt_cache_key": "rollout-v1"
}'POST /v1/responsescurl https://api.evolink.ai/v1/responses \
-H "Authorization: Bearer $EVOLINK_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "gpt-5.6-sol",
"input": "Analyze this architecture and list the main risks.",
"reasoning": {"effort": "high"},
"max_output_tokens": 4000
}'