OpenAI
GPT 5.1 Chat Latest
GPT 5.1 Chat Latest is a reasoning model by OpenAI with vision, web search, prompt caching, structured output — designed for complex, multi-step problem solving where accuracy matters more than speed. It supports a 128K token context window with up to 16K tokens of output. Priced at $1.25 per million input tokens and $10 per million output tokens. Access GPT 5.1 Chat Latest through Inworld Router with OpenAI SDK compatibility, built-in failover, and intelligent routing across providers.
→Web SearchReasoningPrompt CachingResponse SchemaVision
Step 1 — Create Router
curl --location 'https://api.inworld.ai/router/v1/routers' \
--header 'Authorization: Basic <your-api-key>' \
--header 'Content-Type: application/json' \
--data '{
"name": "compare-frontier-models",
"defaultRoute": {
"route_id": "default",
"variants": [
{
"variant": {
"variant_id": "openai/gpt-5.1-chat-latest-a",
"model_id": "openai/gpt-5.1-chat-latest"
},
"weight": 33
},
{
"variant": {
"variant_id": "openai/gpt-3.5-turbo-b",
"model_id": "openai/gpt-3.5-turbo"
},
"weight": 33
},
{
"variant": {
"variant_id": "openai/gpt-3.5-turbo-0125-c",
"model_id": "openai/gpt-3.5-turbo-0125"
},
"weight": 34
}
]
}
}'Step 2 — Chat Completion
curl --location 'https://api.inworld.ai/v1/chat/completions' \
--header 'Authorization: Basic <your-api-key>' \
--header 'Content-Type: application/json' \
--data '{
"model": "inworld/compare-frontier-models",
"messages": [{"role": "user", "content": "Hello!"}]
}'GPT 5.1 Chat Latest pricing and providers
Access GPT 5.1 Chat Latest through OpenAI via Inworld Router or Realtime API.
| Capabilities | Input modalities | Output modalities | |||||
|---|---|---|---|---|---|---|---|
| OpenAI | 128K | 16.4K | $1.25 | $10.00 | +2 |
Other OpenAI models available through Inworld
Compare GPT 5.1 Chat Latest with other OpenAI models available through Inworld Router or Realtime API.
| Capabilities | Input modalities | Output modalities | Inference provider | |||||
|---|---|---|---|---|---|---|---|---|
| GPT 3.5 Turbo | 16.4K | 4.1K | $0.50 | $1.50 | ||||
| GPT 3.5 Turbo 0125 | 16.4K | 4.1K | $0.50 | $1.50 | ||||
| GPT 3.5 Turbo 1106 | 16.4K | 4.1K | $1.00 | $2.00 | ||||
| GPT 3.5 Turbo 16k | 16.4K | 4.1K | $3.00 | $4.00 | ||||
| GPT 4 Turbo | 128K | 4.1K | $10.00 | $30.00 | ||||
| GPT 4 Turbo 2024 04 09 | 128K | 4.1K | $10.00 | $30.00 | ||||
| GPT 4.1 | 1M | 32.8K | $2.00 | $8.00 | +2 | |||
| GPT 4.1 2025 04 14 | 1M | 32.8K | $2.00 | $8.00 | +2 | |||
| GPT 4.1 Mini | 1M | 32.8K | $0.40 | $1.60 | +2 | |||
| GPT 4.1 Mini 2025 04 14 | 1M | 32.8K | $0.40 | $1.60 | +2 | |||
| GPT 4.1 Nano | 1M | 32.8K | $0.10 | $0.40 | +1 | |||
| GPT 4.1 Nano 2025 04 14 | 1M | 32.8K | $0.10 | $0.40 | +1 | |||
| GPT 4o | 128K | 16.4K | $2.50 | $10.00 | +1 | |||
| GPT 4o 2024 05 13 | 128K | 4.1K | $5.00 | $15.00 | ||||
| GPT 4o 2024 08 06 | 128K | 16.4K | $2.50 | $10.00 | +1 | |||
| GPT 4o 2024 11 20 | 128K | 16.4K | $2.50 | $10.00 | +1 | |||
| GPT 4o Audio Preview | 128K | 16.4K | $2.50 | $10.00 | ||||
| GPT 4o Audio Preview 2024 12 17 | 128K | 16.4K | $2.50 | $10.00 | ||||
| GPT 4o Audio Preview 2025 06 03 | 128K | 16.4K | $2.50 | $10.00 | ||||
| GPT 4o Mini | 128K | 16.4K | $0.15 | $0.60 | +1 | |||
| GPT 4o Mini 2024 07 18 | 128K | 16.4K | $0.15 | $0.60 | +1 | |||
| GPT 4o Mini Audio Preview | 128K | 16.4K | $0.15 | $0.60 | ||||
| GPT 4o Mini Audio Preview 2024 12 17 | 128K | 16.4K | $0.15 | $0.60 | ||||
| GPT 4o Mini Search Preview | 128K | 16.4K | $0.15 | $0.60 | +2 | |||
| GPT 4o Mini Search Preview 2025 03 11 | 128K | 16.4K | $0.15 | $0.60 | +1 | |||
| GPT 4o Search Preview | 128K | 16.4K | $2.50 | $10.00 | +2 | |||
| GPT 4o Search Preview 2025 03 11 | 128K | 16.4K | $2.50 | $10.00 | +1 | |||
| GPT 5 | 272K | 128K | $1.25 | $10.00 | +3 | |||
| GPT 5 2025 08 07 | 272K | 128K | $1.25 | $10.00 | +3 | |||
| GPT 5 Chat Latest | 128K | 16.4K | $1.25 | $10.00 | +1 | |||
| GPT 5 Mini | 272K | 128K | $0.25 | $2.00 | +3 | |||
| GPT 5 Mini 2025 08 07 | 272K | 128K | $0.25 | $2.00 | +3 | |||
| GPT 5 Nano | 272K | 128K | $0.05 | $0.40 | +3 | |||
| GPT 5 Nano 2025 08 07 | 272K | 128K | $0.05 | $0.40 | +3 | |||
| GPT 5 Search Api | 272K | 128K | $1.25 | $10.00 | +2 | |||
| GPT 5 Search Api 2025 10 14 | 272K | 128K | $1.25 | $10.00 | +2 | |||
| GPT 5.1 | 272K | 128K | $1.25 | $10.00 | +3 | |||
| GPT 5.1 2025 11 13 | 272K | 128K | $1.25 | $10.00 | +3 | |||
| GPT 5.2 | 272K | 128K | $1.75 | $14.00 | +3 | |||
| GPT 5.2 2025 12 11 | 272K | 128K | $1.75 | $14.00 | +3 | |||
| GPT 5.2 Chat Latest | 128K | 16.4K | $1.75 | $14.00 | +3 | |||
| GPT 5.3 Chat Latest | 128K | 16.4K | $1.75 | $14.00 | +3 | |||
| GPT 5.4 | 1.1M | 128K | $2.50 | $15.00 | +2 | |||
| GPT 5.4 2026 03 05 | 1.1M | 128K | $2.50 | $15.00 | +2 | |||
| GPT 5.4 Mini | 272K | 128K | $0.75 | $4.50 | +3 | |||
| GPT 5.4 Nano | 272K | 128K | $0.20 | $1.25 | +3 | |||
| GPT Audio | 128K | 16.4K | $2.50 | $10.00 | ||||
| GPT Audio 1.5 | 128K | 16.4K | $2.50 | $10.00 | ||||
| GPT Audio 2025 08 28 | 128K | 16.4K | $2.50 | $10.00 | ||||
| GPT Audio Mini | 128K | 16.4K | $0.60 | $2.40 | ||||
| GPT Audio Mini 2025 10 06 | 128K | 16.4K | $0.60 | $2.40 | ||||
| GPT Audio Mini 2025 12 15 | 128K | 16.4K | $0.60 | $2.40 | ||||
| GPT Oss 120b | 131.1K | 131.1K | $0.039 | $0.19 | +1 | |||
| GPT Oss 120b Turbo | — | — | $0.15 | $0.60 | — | |||
| GPT Oss 20b | 131.1K | 32.8K | $0.03 | $0.14 | +1 | |||
| O3 | 200K | 100K | $2.00 | $8.00 | +3 | |||
| O3 2025 04 16 | 200K | 100K | $2.00 | $8.00 | +3 | |||
| O3 Mini | 200K | 100K | $1.10 | $4.40 | +1 | |||
| O3 Mini 2025 01 31 | 200K | 100K | $1.10 | $4.40 | +1 | |||
| O4 Mini | 200K | 100K | $1.10 | $4.40 | +3 | |||
| O4 Mini 2025 04 16 | 200K | 100K | $1.10 | $4.40 | +3 | |||
| Openai/gpt Oss Safeguard 20b | 131.1K | 65.5K | $0.075 | $0.30 | +1 |
Start building with GPT 5.1 Chat Latest
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