Migrating from gpt-4-turbo to gpt-5.6-sol
What changes when you move from gpt-4-turbo to gpt-5.6-sol: input price −60%, output price −33.3%, context window 128,000 → 1,050,000 tokens.
- From
- gpt-4-turbo
- Status
- Deprecated
- Shutdown
- Oct 23, 2026
- Time left
- 8 days
- Status
- Active
- Shutdown
- none announced
- Time left
- —
Prices
USD per 1M tokens, standard tier| Type | gpt-4-turbo | gpt-5.6-sol | Change |
|---|---|---|---|
| Input | $10.00first seen October 1, 2026 · source | $4.00first seen October 1, 2026 · source | −60% |
| Cached input | Not published | $0.40first seen October 1, 2026 · source | — |
| Output | $30.00first seen October 1, 2026 · source | $20.00first seen October 1, 2026 · source | −33.3% |
At 1M input and 250K output tokens a month: $17.50 on gpt-4-turbo, $9.00 on gpt-5.6-sol (−48.6%).
Other tiers, prompt-size bands and modalities are on each model's page.
Limits
Tokens| Limit | gpt-4-turbo | gpt-5.6-sol | Change |
|---|---|---|---|
| Context window | 128,000 tokensin place when tracking began (October 6, 2026) · source | 1,050,000 tokensin place when tracking began (October 7, 2026) · source | +720.3% |
| Max output tokens | 4,096 tokensin place when tracking began (October 6, 2026) · source | 128,000 tokensin place when tracking began (October 7, 2026) · source | +3025% |
Benchmarks
Same benchmark and source on both sides; settings named where they differ| Benchmark | gpt-4-turbo | gpt-5.6-sol | Change |
|---|---|---|---|
| Arena TextArena, xhigh effort (vs no setting). Ranges don't overlap. | 1325 ±4 | 1485 ±4 | +160 |
| Arena Text: CodingArena, xhigh effort (vs no setting). Ranges don't overlap. | 1347 ±7 | 1534 ±7 | +187 |
| Arena VisionArena, xhigh effort (vs no setting). Ranges don't overlap. | 1112 ±12 | 1287 ±7 | +175 |
| FrontierMath Tiers 1-3Epoch AI, max effort (vs no setting). | 0.7% | 89.1% | +88.4 pts |
GPQA DiamondEpoch AI, max effort (vs no setting).Other settings
| 46.6% | 93.5% | +46.9 pts |
OTIS Mock AIME 2024-2025Epoch AI, max effort (vs no setting).Other settings
| 6.7% | 100.0% | +93.3 pts |
A score from one source is never compared with another source's, and company-reported scores are compared only within the same company; settings named where they differ. Data: Arena (arena.ai), CC BY 4.0; Epoch AI, Capabilities & benchmarking (epoch.ai/benchmarks), CC BY.
Features and parameters
Compare modelsSame on both
- Function calling: supported on both.gpt-4-turbo: in place when tracking began (October 6, 2026) · source · gpt-5.6-sol: in place when tracking began (October 7, 2026) · source
- Batch API: supported on both.gpt-4-turbo: in place when tracking began (October 6, 2026) · source · gpt-5.6-sol: in place when tracking began (October 7, 2026) · source
- Image input: supported on both.gpt-4-turbo: in place when tracking began (October 6, 2026) · source · gpt-5.6-sol: in place when tracking began (October 7, 2026) · source
- Fine-tuning: not supported on both.gpt-4-turbo: in place when tracking began (October 6, 2026) · source · gpt-5.6-sol: in place when tracking began (October 7, 2026) · source
Not published for gpt-4-turbo: Structured outputs, Prompt caching, PDF input, Reasoning / thinking, Built-in web search, temperature parameter, top_p parameter, logprobs.
Not published for gpt-5.6-sol: PDF input, temperature parameter, top_p parameter, logprobs.
Free tier
gpt-4-turbo: no free tier listed
gpt-5.6-sol: Free for shared data, 1M tokens a day for Launch and Grow (250K for Build), in place when tracking began (October 12, 2026) (source) · All free models
gpt-5.6-sol adds a free tier.
Aliases
All aliasesAliases pointing at gpt-4-turbo: gpt-4-turbo (in place when tracking began (October 7, 2026) · source)
Aliases pointing at gpt-5.6-sol: gpt-daybreak-blue-latest (in place when tracking began (October 7, 2026) · source)
On cloud platforms
All platform dates| Model | Platform | Platform ID | Shutdown | Time left |
|---|---|---|---|---|
| gpt-5.6-sol | Amazon Bedrock | openai.gpt-5.6-sol | not before Jul 13, 2027Active | |
| gpt-5.6-sol | Microsoft Foundryversion 2026-07-09 | gpt-5.6-sol | Jan 11, 2028Active | 453 days |
Read daily from each platform's own pages. The status above uses each company's own date. Time left counts to 00:00 UTC on the shutdown date, which is the evening before in ET.
Checklist
- Change the model string from
gpt-4-turbotogpt-5.6-sol.
Counting to 8:00 pm ET on October 22, 2026, which is 00:00 UTC on October 23, 2026.
Compared from AIWire's published data when this page loaded. Each fact links to the page it came from. Model pages: gpt-4-turbo, gpt-5.6-sol.